diff --git a/apps/settings/Makefile b/apps/settings/Makefile
index 40bd2ac72..0a03bf605 100644
--- a/apps/settings/Makefile
+++ b/apps/settings/Makefile
@@ -3,11 +3,14 @@ app_headers += apps/settings/app.h
 
 app_objs += $(addprefix apps/settings/,\
   app.o\
-  helpers.o\
-  language_controller.o\
   main_controller.o\
   settings_message_tree.o\
-  sub_controller.o\
+  sub_menu/about_controller.o\
+  sub_menu/display_mode_controller.o\
+  sub_menu/exam_mode_controller.o\
+  sub_menu/generic_sub_controller.o\
+  sub_menu/language_controller.o\
+  sub_menu/preferences_controller.o\
 )
 
 i18n_files += $(addprefix apps/settings/,\
diff --git a/apps/settings/helpers.cpp b/apps/settings/helpers.cpp
deleted file mode 100644
index 0f8cb8d7b..000000000
--- a/apps/settings/helpers.cpp
+++ /dev/null
@@ -1,25 +0,0 @@
-#include "helpers.h"
-#include <poincare/layout_helper.h>
-#include <ion/charset.h>
-
-using namespace Poincare;
-
-namespace Settings {
-namespace Helpers {
-
-Layout CartesianComplexFormat(KDText::FontSize fontSize) {
-  const char text[] = {'a','+', Ion::Charset::IComplex, 'b', ' '};
-  return LayoutHelper::String(text, sizeof(text), fontSize);
-}
-
-Layout PolarComplexFormat(KDText::FontSize fontSize) {
-  const char base[] = {'r', Ion::Charset::Exponential};
-  const char superscript[] = {Ion::Charset::IComplex, Ion::Charset::SmallTheta, ' '};
-  return HorizontalLayout(
-      LayoutHelper::String(base, sizeof(base), fontSize),
-      VerticalOffsetLayout(LayoutHelper::String(superscript, sizeof(superscript), fontSize), VerticalOffsetLayoutNode::Type::Superscript)
-     );
-}
-
-}
-}
diff --git a/apps/settings/helpers.h b/apps/settings/helpers.h
deleted file mode 100644
index dc1b2fc3b..000000000
--- a/apps/settings/helpers.h
+++ /dev/null
@@ -1,15 +0,0 @@
-#ifndef SETTINGS_HELPERS_H
-#define SETTINGS_HELPERS_H
-
-#include <poincare.h>
-
-namespace Settings {
-namespace Helpers {
-
-Poincare::Layout CartesianComplexFormat(KDText::FontSize fontSize);
-Poincare::Layout PolarComplexFormat(KDText::FontSize fontSize);
-
-}
-}
-
-#endif
diff --git a/apps/settings/main_controller.cpp b/apps/settings/main_controller.cpp
index 7fd26fcec..5b23cc79f 100644
--- a/apps/settings/main_controller.cpp
+++ b/apps/settings/main_controller.cpp
@@ -1,5 +1,4 @@
 #include "main_controller.h"
-#include "helpers.h"
 #include "../global_preferences.h"
 #include "../i18n.h"
 #include <assert.h>
@@ -42,13 +41,14 @@ MainController::MainController(Responder * parentResponder) :
 #if EPSILON_SOFTWARE_UPDATE_PROMPT
   m_updateCell(I18n::Message::Default, KDText::FontSize::Large),
 #endif
-  m_complexFormatCell(I18n::Message::Default, KDText::FontSize::Large),
   m_brightnessCell(I18n::Message::Default, KDText::FontSize::Large),
-  m_complexFormatLayout(),
   m_selectableTableView(this),
   m_messageTreeModel((MessageTree *)&model),
-  m_subController(this),
-  m_languageController(this, 13)
+  m_preferencesController(this),
+  m_displayModeController(this),
+  m_languageController(this, 13),
+  m_examModeController(this),
+  m_aboutController(this)
 {
   for (int i = 0; i < k_numberOfSimpleChevronCells; i++) {
     m_cells[i].setMessageFontSize(KDText::FontSize::Large);
@@ -97,9 +97,30 @@ bool MainController::handleEvent(Ion::Events::Event event) {
     }
   }
   if (event == Ion::Events::OK || event == Ion::Events::EXE || event == Ion::Events::Right) {
-    m_subController.setMessageTreeModel(m_messageTreeModel->children(selectedRow()));
+    GenericSubController * subController = nullptr;
+    switch (selectedRow()) {
+      case 1:
+        subController = &m_displayModeController;
+        break;
+      case 4:
+      case 5:
+        assert(false);
+      case 6:
+        subController = &m_examModeController;
+        break;
+#if EPSILON_SOFTWARE_UPDATE_PROMPT
+      case 8:
+#else
+      case 7:
+#endif
+        subController = &m_aboutController;
+        break;
+      default:
+        subController = &m_preferencesController;
+    }
+    subController->setMessageTreeModel(m_messageTreeModel->children(selectedRow()));
     StackViewController * stack = stackController();
-    stack->push(&m_subController);
+    stack->push(subController);
     return true;
   }
   return false;
@@ -128,15 +149,13 @@ HighlightCell * MainController::reusableCell(int index, int type) {
     return &m_cells[index];
   }
   assert(index == 0);
-  if (type == 2) {
-    return &m_brightnessCell;
-  }
 #if EPSILON_SOFTWARE_UPDATE_PROMPT
-  if (type == 3) {
+  if (type == 2) {
     return &m_updateCell;
   }
 #endif
-  return &m_complexFormatCell;
+  assert(type == 1);
+  return &m_brightnessCell;
 }
 
 int MainController::reusableCellCount(int type) {
@@ -147,15 +166,12 @@ int MainController::reusableCellCount(int type) {
 }
 
 int MainController::typeAtLocation(int i, int j) {
-  if (j == 3) {
-    return 1;
-  }
   if (j == 4) {
-    return 2;
+    return 1;
   }
 #if EPSILON_SOFTWARE_UPDATE_PROMPT
   if (j == 7) {
-    return 3;
+    return 2;
   }
 #endif
   return 0;
@@ -164,17 +180,6 @@ int MainController::typeAtLocation(int i, int j) {
 void MainController::willDisplayCellForIndex(HighlightCell * cell, int index) {
   MessageTableCell * myCell = (MessageTableCell *)cell;
   myCell->setMessage(m_messageTreeModel->children(index)->label());
-
-  if (index == 3) {
-    if (Preferences::sharedPreferences()->complexFormat() == Preferences::ComplexFormat::Cartesian) {
-      m_complexFormatLayout = Helpers::CartesianComplexFormat(KDText::FontSize::Small);
-    } else {
-      m_complexFormatLayout = Helpers::PolarComplexFormat(KDText::FontSize::Small);
-    }
-    MessageTableCellWithChevronAndExpression * myExpCell = (MessageTableCellWithChevronAndExpression *)cell;
-    myExpCell->setLayout(m_complexFormatLayout);
-    return;
-  }
   if (index == 4) {
     MessageTableCellWithGauge * myGaugeCell = (MessageTableCellWithGauge *)cell;
     GaugeView * myGauge = (GaugeView *)myGaugeCell->accessoryView();
@@ -195,20 +200,23 @@ void MainController::willDisplayCellForIndex(HighlightCell * cell, int index) {
   }
 #endif
   MessageTableCellWithChevronAndMessage * myTextCell = (MessageTableCellWithChevronAndMessage *)cell;
+  int childIndex = -1;
   switch (index) {
     case 0:
-      myTextCell->setSubtitle(m_messageTreeModel->children(index)->children((int)Preferences::sharedPreferences()->angleUnit())->label());
+      childIndex = (int)Preferences::sharedPreferences()->angleUnit();
       break;
     case 1:
-      myTextCell->setSubtitle(m_messageTreeModel->children(index)->children((int)Preferences::sharedPreferences()->displayMode())->label());
+      childIndex = (int)Preferences::sharedPreferences()->displayMode();
       break;
     case 2:
-      myTextCell->setSubtitle(m_messageTreeModel->children(index)->children((int)Preferences::sharedPreferences()->editionMode())->label());
+      childIndex = (int)Preferences::sharedPreferences()->editionMode();
       break;
-    default:
-      myTextCell->setSubtitle(I18n::Message::Default);
+    case 3:
+      childIndex = (int)Preferences::sharedPreferences()->complexFormat();
       break;
   }
+  I18n::Message message = childIndex >= 0 ? m_messageTreeModel->children(index)->children(childIndex)->label() : I18n::Message::Default;
+  myTextCell->setSubtitle(message);
 }
 
 void MainController::viewWillAppear() {
diff --git a/apps/settings/main_controller.h b/apps/settings/main_controller.h
index 997b627f3..f1a6edbbd 100644
--- a/apps/settings/main_controller.h
+++ b/apps/settings/main_controller.h
@@ -2,9 +2,12 @@
 #define SETTINGS_MAIN_CONTROLLER_H
 
 #include <escher.h>
-#include "sub_controller.h"
 #include "settings_message_tree.h"
-#include "language_controller.h"
+#include "sub_menu/about_controller.h"
+#include "sub_menu/display_mode_controller.h"
+#include "sub_menu/exam_mode_controller.h"
+#include "sub_menu/language_controller.h"
+#include "sub_menu/preferences_controller.h"
 
 namespace Settings {
 
@@ -31,15 +34,17 @@ private:
 #else
   constexpr static int k_totalNumberOfCell = 8;
 #endif
-  constexpr static int k_numberOfSimpleChevronCells = 6;
+  constexpr static int k_numberOfSimpleChevronCells = 7;
   MessageTableCellWithChevronAndMessage m_cells[k_numberOfSimpleChevronCells];
-  MessageTableCellWithChevronAndExpression m_complexFormatCell;
   MessageTableCellWithGauge m_brightnessCell;
-  Poincare::Layout m_complexFormatLayout;
   SelectableTableView m_selectableTableView;
   MessageTree * m_messageTreeModel;
-  SubController m_subController;
+  PreferencesController m_preferencesController;
+  DisplayModeController m_displayModeController;
   LanguageController m_languageController;
+  ExamModeController m_examModeController;
+  AboutController m_aboutController;
+
 };
 
 }
diff --git a/apps/settings/sub_controller.cpp b/apps/settings/sub_controller.cpp
deleted file mode 100644
index cd7f8934a..000000000
--- a/apps/settings/sub_controller.cpp
+++ /dev/null
@@ -1,270 +0,0 @@
-#include "sub_controller.h"
-#include "helpers.h"
-#include "../global_preferences.h"
-#include "../apps_container.h"
-#include "../shared/poincare_helpers.h"
-#include <assert.h>
-#include <cmath>
-
-using namespace Poincare;
-using namespace Shared;
-
-namespace Settings {
-
-SubController::SubController(Responder * parentResponder) :
-  ViewController(parentResponder),
-  m_editableCell(&m_selectableTableView, this, m_draftTextBuffer),
-  m_selectableTableView(this),
-  m_messageTreeModel(nullptr)
-{
-  m_selectableTableView.setTopMargin(k_topBottomMargin);
-  m_selectableTableView.setBottomMargin(k_topBottomMargin);
-  for (int i = 0; i < k_totalNumberOfCell; i++) {
-    m_cells[i].setMessageFontSize(KDText::FontSize::Large);
-    m_cells[i].setAccessoryFontSize(KDText::FontSize::Small);
-    m_cells[i].setAccessoryTextColor(Palette::GreyDark);
-  }
-  m_complexFormatLayout[0] = Helpers::CartesianComplexFormat(KDText::FontSize::Large);
-  m_complexFormatLayout[1] = Helpers::PolarComplexFormat(KDText::FontSize::Large);
-  for (int i = 0; i < 2; i++) {
-    m_complexFormatCells[i].setLayout(m_complexFormatLayout[i]);
-  }
-  m_editableCell.setMessage(I18n::Message::SignificantFigures);
-  m_editableCell.setMessageFontSize(KDText::FontSize::Large);
-}
-
-const char * SubController::title() {
-  if (m_messageTreeModel) {
-    return I18n::translate(m_messageTreeModel->label());
-  }
-  return "";
-}
-
-View * SubController::view() {
-  return &m_selectableTableView;
-}
-
-void SubController::didEnterResponderChain(Responder * previousFirstResponder) {
-  if (m_messageTreeModel->label() == I18n::Message::ExamMode) {
-    m_selectableTableView.reloadData();
-  }
-}
-
-void SubController::didBecomeFirstResponder() {
-  selectCellAtLocation(0, valueIndexForPreference(m_messageTreeModel->label()));
-  app()->setFirstResponder(&m_selectableTableView);
-}
-
-bool SubController::handleEvent(Ion::Events::Event event) {
-  /* We hide here the activation hardware test app: in the menu "about", by
-   * clicking on '6' on the last row. */
-  if ((event == Ion::Events::Six || event == Ion::Events::LowerT || event == Ion::Events::UpperT) && m_messageTreeModel->label() == I18n::Message::About && selectedRow() == numberOfRows()-1) {
-    app()->displayModalViewController(&m_hardwareTestPopUpController, 0.f, 0.f, Metric::ExamPopUpTopMargin, Metric::PopUpRightMargin, Metric::ExamPopUpBottomMargin, Metric::PopUpLeftMargin);
-    return true;
-  }
-  if (event == Ion::Events::OK || event == Ion::Events::EXE) {
-    /* Behaviour of "Exam mode" menu*/
-    if (m_messageTreeModel->label() == I18n::Message::ExamMode) {
-      if (GlobalPreferences::sharedGlobalPreferences()->examMode() == GlobalPreferences::ExamMode::Activate) {
-        return false;
-      }
-      AppsContainer * container = (AppsContainer *)(app()->container());
-      container->displayExamModePopUp(true);
-      return true;
-    }
-    /* Behaviour of "About" menu */
-    if (m_messageTreeModel->label() == I18n::Message::About) {
-      if (selectedRow() == 0) {
-        MessageTableCellWithBuffer * myCell = (MessageTableCellWithBuffer *)m_selectableTableView.selectedCell();
-        if (strcmp(myCell->accessoryText(), Ion::patchLevel()) == 0) {
-          myCell->setAccessoryText(Ion::softwareVersion());
-          return true;
-        }
-        myCell->setAccessoryText(Ion::patchLevel());
-        return true;
-      }
-      return false;
-    }
-    /* Generic behaviour of preference menu*/
-    assert(m_messageTreeModel->label() != I18n::Message::DisplayMode || selectedRow() != numberOfRows()-1); // In that case, events OK and EXE are handled by the cell
-    setPreferenceWithValueIndex(m_messageTreeModel->label(), selectedRow());
-    AppsContainer * myContainer = (AppsContainer * )app()->container();
-    myContainer->refreshPreferences();
-    StackViewController * stack = stackController();
-    stack->pop();
-    return true;
-  }
-  if (event == Ion::Events::Left) {
-    stackController()->pop();
-    return true;
-  }
-  return false;
-}
-
-int SubController::numberOfRows() {
-  if (m_messageTreeModel) {
-    return m_messageTreeModel->numberOfChildren();
-  }
-  return 0;
-}
-
-HighlightCell * SubController::reusableCell(int index, int type) {
-  if (type == 2) {
-    assert(index == 0);
-    return &m_editableCell;
-  } else if (type == 1) {
-    assert(index >= 0 && index < 2);
-    return &m_complexFormatCells[index];
-  }
-  assert(index >= 0 && index < k_totalNumberOfCell);
-  return &m_cells[index];
-}
-
-int SubController::reusableCellCount(int type) {
-  switch (type) {
-    case 0:
-      return k_totalNumberOfCell;
-    case 1:
-      return 2;
-    case 2:
-      return 1;
-    default:
-      assert(false);
-      return 0;
-  }
-}
-
-int SubController::typeAtLocation(int i, int j) {
-  if (m_messageTreeModel->label() == I18n::Message::ComplexFormat) {
-    return 1;
-  }
-  if (m_messageTreeModel->label() == I18n::Message::DisplayMode && j == numberOfRows()-1) {
-    return 2;
-  }
-  return 0;
-}
-
-KDCoordinate SubController::rowHeight(int j) {
-  return Metric::ParameterCellHeight;
-}
-
-KDCoordinate SubController::cumulatedHeightFromIndex(int j) {
-  return rowHeight(0) * j;
-}
-
-int SubController::indexFromCumulatedHeight(KDCoordinate offsetY) {
-  KDCoordinate height = rowHeight(0);
-  if (height == 0) {
-    return 0;
-  }
-  return (offsetY - 1) / height;
-}
-
-void SubController::willDisplayCellForIndex(HighlightCell * cell, int index) {
-  if (m_messageTreeModel->label() == I18n::Message::ComplexFormat) {
-    return;
-  }
-  /* Number of significants figure row */
-  if (m_messageTreeModel->label() == I18n::Message::DisplayMode && index == numberOfRows()-1) {
-    MessageTableCellWithEditableText * myCell = (MessageTableCellWithEditableText *)cell;
-    char buffer[3];
-    Integer(Preferences::sharedPreferences()->numberOfSignificantDigits()).serialize(buffer, 3);
-    myCell->setAccessoryText(buffer);
-    return;
-  }
-  MessageTableCellWithBuffer * myCell = (MessageTableCellWithBuffer *)cell;
-  myCell->setMessage(m_messageTreeModel->children(index)->label());
-  myCell->setMessageFontSize(KDText::FontSize::Large);
-  myCell->setAccessoryText("");
-  if (m_messageTreeModel->label() == I18n::Message::ExamMode && GlobalPreferences::sharedGlobalPreferences()->examMode() == GlobalPreferences::ExamMode::Activate) {
-    myCell->setMessage(I18n::Message::ExamModeActive);
-  }
-  if (m_messageTreeModel->label() == I18n::Message::About) {
-    myCell->setMessageFontSize(KDText::FontSize::Small);
-    const char * messages[] = {
-      Ion::softwareVersion(),
-      Ion::serialNumber(),
-      Ion::fccId()
-    };
-    assert(index >= 0 && index < 3);
-    myCell->setAccessoryText(messages[index]);
-  }
-}
-
-void SubController::setMessageTreeModel(const MessageTree * messageTreeModel) {
-  m_messageTreeModel = (MessageTree *)messageTreeModel;
-}
-
-void SubController::viewWillAppear() {
-  m_selectableTableView.reloadData();
-}
-
-void SubController::viewDidDisappear() {
-  m_selectableTableView.deselectTable();
-}
-
-bool SubController::textFieldShouldFinishEditing(TextField * textField, Ion::Events::Event event) {
-  return (event == Ion::Events::Up && selectedRow() > 0)
-     || TextFieldDelegate::textFieldShouldFinishEditing(textField, event);
-}
-
-bool SubController::textFieldDidFinishEditing(TextField * textField, const char * text, Ion::Events::Event event) {
-  Context * globalContext = textFieldDelegateApp()->localContext();
-  float floatBody = PoincareHelpers::ApproximateToScalar<float>(text, *globalContext);
-  if (std::isnan(floatBody) || std::isinf(floatBody)) {
-    floatBody = PrintFloat::k_numberOfPrintedSignificantDigits;
-  }
-  if (floatBody < 1) {
-   floatBody = 1;
-  }
-  if (floatBody > PrintFloat::k_numberOfStoredSignificantDigits) {
-    floatBody = PrintFloat::k_numberOfStoredSignificantDigits;
-  }
-  Preferences::sharedPreferences()->setNumberOfSignificantDigits((char)std::round(floatBody));
-  m_selectableTableView.reloadCellAtLocation(0, selectedRow());
-  if (event == Ion::Events::Up || event == Ion::Events::OK) {
-    m_selectableTableView.handleEvent(event);
-  }
-  return true;
-}
-
-StackViewController * SubController::stackController() const {
-  return (StackViewController *)parentResponder();
-}
-
-void SubController::setPreferenceWithValueIndex(I18n::Message message, int valueIndex) {
-  if (message == I18n::Message::AngleUnit) {
-    Preferences::sharedPreferences()->setAngleUnit((Preferences::AngleUnit)valueIndex);
-  }
-  if (message == I18n::Message::DisplayMode) {
-    Preferences::sharedPreferences()->setDisplayMode((Preferences::PrintFloatMode)valueIndex);
-  }
-  if (message == I18n::Message::EditionMode) {
-    Preferences::sharedPreferences()->setEditionMode((Preferences::EditionMode)valueIndex);
-  }
-  if (message == I18n::Message::ComplexFormat) {
-    Preferences::sharedPreferences()->setComplexFormat((Preferences::ComplexFormat)valueIndex);
-  }
-}
-
-int SubController::valueIndexForPreference(I18n::Message message) {
-  if (message == I18n::Message::AngleUnit) {
-    return (int)Preferences::sharedPreferences()->angleUnit();
-  }
-  if (message == I18n::Message::DisplayMode) {
-    return (int)Preferences::sharedPreferences()->displayMode();
-  }
-  if (message == I18n::Message::EditionMode) {
-    return (int)Preferences::sharedPreferences()->editionMode();
-  }
-  if (message == I18n::Message::ComplexFormat) {
-    return (int)Preferences::sharedPreferences()->complexFormat();
-  }
-  return 0;
-}
-
-Shared::TextFieldDelegateApp * SubController::textFieldDelegateApp() {
-  return (Shared::TextFieldDelegateApp *)app();
-}
-
-}
diff --git a/apps/settings/sub_controller.h b/apps/settings/sub_controller.h
deleted file mode 100644
index 50d758836..000000000
--- a/apps/settings/sub_controller.h
+++ /dev/null
@@ -1,51 +0,0 @@
-#ifndef SETTINGS_SUB_CONTROLLER_H
-#define SETTINGS_SUB_CONTROLLER_H
-
-#include <escher.h>
-#include "settings_message_tree.h"
-#include "../hardware_test/pop_up_controller.h"
-#include "../shared/parameter_text_field_delegate.h"
-
-namespace Settings {
-
-class SubController : public ViewController, public ListViewDataSource, public SelectableTableViewDataSource, public Shared::ParameterTextFieldDelegate {
-public:
-  SubController(Responder * parentResponder);
-  View * view() override;
-  const char * title() override;
-  bool handleEvent(Ion::Events::Event event) override;
-  void didEnterResponderChain(Responder * previousFirstResponder) override;
-  void didBecomeFirstResponder() override;
-  int numberOfRows() override;
-  KDCoordinate rowHeight(int j) override;
-  KDCoordinate cumulatedHeightFromIndex(int j) override;
-  int indexFromCumulatedHeight(KDCoordinate offsetY) override;
-  HighlightCell * reusableCell(int index, int type) override;
-  int reusableCellCount(int type) override;
-  int typeAtLocation(int i, int j) override;
-  void willDisplayCellForIndex(HighlightCell * cell, int index) override;
-  void setMessageTreeModel(const MessageTree * messageTreeModel);
-  void viewWillAppear() override;
-  void viewDidDisappear() override;
-  bool textFieldShouldFinishEditing(TextField * textField, Ion::Events::Event event) override;
-  bool textFieldDidFinishEditing(TextField * textField, const char * text, Ion::Events::Event event) override;
-private:
-  StackViewController * stackController() const;
-  void setPreferenceWithValueIndex(I18n::Message message, int valueIndex);
-  int valueIndexForPreference(I18n::Message message);
-  Shared::TextFieldDelegateApp * textFieldDelegateApp() override;
-  constexpr static KDCoordinate k_topBottomMargin = 13;
-  constexpr static int k_totalNumberOfCell = (Ion::Display::Height-2*k_topBottomMargin-Metric::TitleBarHeight-Metric::StackTitleHeight)/Metric::ParameterCellHeight;
-  MessageTableCellWithBuffer m_cells[k_totalNumberOfCell];
-  ExpressionTableCell m_complexFormatCells[2];
-  Poincare::Layout m_complexFormatLayout[2];
-  MessageTableCellWithEditableText m_editableCell;
-  char m_draftTextBuffer[MessageTableCellWithEditableText::k_bufferLength];
-  SelectableTableView m_selectableTableView;
-  MessageTree * m_messageTreeModel;
-  HardwareTest::PopUpController m_hardwareTestPopUpController;
-};
-
-}
-
-#endif
diff --git a/apps/settings/sub_menu/about_controller.cpp b/apps/settings/sub_menu/about_controller.cpp
new file mode 100644
index 000000000..eeb96fe12
--- /dev/null
+++ b/apps/settings/sub_menu/about_controller.cpp
@@ -0,0 +1,65 @@
+#include "about_controller.h"
+#include "../../apps_container.h"
+#include <assert.h>
+#include <cmath>
+
+using namespace Shared;
+
+namespace Settings {
+
+AboutController::AboutController(Responder * parentResponder) :
+  GenericSubController(parentResponder)
+{
+  for (int i = 0; i < k_totalNumberOfCell; i++) {
+    m_cells[i].setMessageFontSize(KDText::FontSize::Large);
+    m_cells[i].setAccessoryFontSize(KDText::FontSize::Small);
+    m_cells[i].setAccessoryTextColor(Palette::GreyDark);
+  }
+}
+
+bool AboutController::handleEvent(Ion::Events::Event event) {
+  /* We hide here the activation hardware test app: in the menu "about", by
+   * clicking on '6' on the last row. */
+  if ((event == Ion::Events::Six || event == Ion::Events::LowerT || event == Ion::Events::UpperT) && m_messageTreeModel->label() == I18n::Message::About && selectedRow() == numberOfRows()-1) {
+    app()->displayModalViewController(&m_hardwareTestPopUpController, 0.f, 0.f, Metric::ExamPopUpTopMargin, Metric::PopUpRightMargin, Metric::ExamPopUpBottomMargin, Metric::PopUpLeftMargin);
+    return true;
+  }
+  if (event == Ion::Events::OK || event == Ion::Events::EXE) {
+    if (selectedRow() == 0) {
+      MessageTableCellWithBuffer * myCell = (MessageTableCellWithBuffer *)m_selectableTableView.selectedCell();
+      if (strcmp(myCell->accessoryText(), Ion::patchLevel()) == 0) {
+        myCell->setAccessoryText(Ion::softwareVersion());
+        return true;
+      }
+      myCell->setAccessoryText(Ion::patchLevel());
+      return true;
+    }
+    return false;
+  }
+  return GenericSubController::handleEvent(event);
+}
+
+HighlightCell * AboutController::reusableCell(int index, int type) {
+  assert(type == 0);
+  assert(index >= 0 && index < k_totalNumberOfCell);
+  return &m_cells[index];
+}
+
+int AboutController::reusableCellCount(int type) {
+  assert(type == 0);
+  return k_totalNumberOfCell;
+}
+
+void AboutController::willDisplayCellForIndex(HighlightCell * cell, int index) {
+  GenericSubController::willDisplayCellForIndex(cell, index);
+  MessageTableCellWithBuffer * myCell = (MessageTableCellWithBuffer *)cell;
+  static const char * messages[] = {
+    Ion::softwareVersion(),
+    Ion::serialNumber(),
+    Ion::fccId()
+  };
+  assert(index >= 0 && index < 3);
+  myCell->setAccessoryText(messages[index]);
+}
+
+}
diff --git a/apps/settings/sub_menu/about_controller.h b/apps/settings/sub_menu/about_controller.h
new file mode 100644
index 000000000..57d66087b
--- /dev/null
+++ b/apps/settings/sub_menu/about_controller.h
@@ -0,0 +1,24 @@
+#ifndef SETTINGS_ABOUT_CONTROLLER_H
+#define SETTINGS_ABOUT_CONTROLLER_H
+
+#include "generic_sub_controller.h"
+#include "../../hardware_test/pop_up_controller.h"
+
+namespace Settings {
+
+class AboutController : public GenericSubController {
+public:
+  AboutController(Responder * parentResponder);
+  bool handleEvent(Ion::Events::Event event) override;
+  HighlightCell * reusableCell(int index, int type) override;
+  int reusableCellCount(int type) override;
+  void willDisplayCellForIndex(HighlightCell * cell, int index) override;
+private:
+  constexpr static int k_totalNumberOfCell = 3;
+  MessageTableCellWithBuffer m_cells[k_totalNumberOfCell];
+  HardwareTest::PopUpController m_hardwareTestPopUpController;
+};
+
+}
+
+#endif
diff --git a/apps/settings/sub_menu/display_mode_controller.cpp b/apps/settings/sub_menu/display_mode_controller.cpp
new file mode 100644
index 000000000..f558ed69e
--- /dev/null
+++ b/apps/settings/sub_menu/display_mode_controller.cpp
@@ -0,0 +1,85 @@
+#include "display_mode_controller.h"
+#include "../../shared/poincare_helpers.h"
+#include <assert.h>
+#include <cmath>
+
+using namespace Poincare;
+using namespace Shared;
+
+namespace Settings {
+
+DisplayModeController::DisplayModeController(Responder * parentResponder) :
+  PreferencesController(parentResponder),
+  m_editableCell(&m_selectableTableView, this, m_draftTextBuffer)
+{
+  m_editableCell.setMessage(I18n::Message::SignificantFigures);
+  m_editableCell.setMessageFontSize(KDText::FontSize::Large);
+}
+
+HighlightCell * DisplayModeController::reusableCell(int index, int type) {
+  if (type == 1) {
+    assert(index == 0);
+    return &m_editableCell;
+  }
+  return PreferencesController::reusableCell(index, type);
+}
+
+int DisplayModeController::reusableCellCount(int type) {
+  switch (type) {
+    case 0:
+      return PreferencesController::k_totalNumberOfCell;
+    case 1:
+      return 1;
+    default:
+      assert(false);
+      return 0;
+  }
+}
+
+int DisplayModeController::typeAtLocation(int i, int j) {
+  return (j == numberOfRows() - 1 ? 1 : 0);
+}
+
+void DisplayModeController::willDisplayCellForIndex(HighlightCell * cell, int index) {
+  /* Number of significants figure row */
+  if (index == numberOfRows()-1) {
+    GenericSubController::willDisplayCellForIndex(cell, index);
+    MessageTableCellWithEditableText * myCell = (MessageTableCellWithEditableText *)cell;
+    char buffer[3];
+    Integer(Preferences::sharedPreferences()->numberOfSignificantDigits()).serialize(buffer, 3);
+    myCell->setAccessoryText(buffer);
+    return;
+  }
+  PreferencesController::willDisplayCellForIndex(cell, index);
+}
+
+bool DisplayModeController::textFieldShouldFinishEditing(TextField * textField, Ion::Events::Event event) {
+  return (event == Ion::Events::Up && selectedRow() > 0)
+     || TextFieldDelegate::textFieldShouldFinishEditing(textField, event);
+}
+
+bool DisplayModeController::textFieldDidFinishEditing(TextField * textField, const char * text, Ion::Events::Event event) {
+  Context * globalContext = textFieldDelegateApp()->localContext();
+  float floatBody = PoincareHelpers::ApproximateToScalar<float>(text, *globalContext);
+  if (std::isnan(floatBody) || std::isinf(floatBody)) {
+    floatBody = PrintFloat::k_numberOfPrintedSignificantDigits;
+  }
+  if (floatBody < 1) {
+   floatBody = 1;
+  }
+  if (floatBody > PrintFloat::k_numberOfStoredSignificantDigits) {
+    floatBody = PrintFloat::k_numberOfStoredSignificantDigits;
+  }
+  Preferences::sharedPreferences()->setNumberOfSignificantDigits((char)std::round(floatBody));
+  m_selectableTableView.reloadCellAtLocation(0, selectedRow());
+  if (event == Ion::Events::Up || event == Ion::Events::OK) {
+    m_selectableTableView.handleEvent(event);
+  }
+  return true;
+}
+
+Shared::TextFieldDelegateApp * DisplayModeController::textFieldDelegateApp() {
+  return (Shared::TextFieldDelegateApp *)app();
+}
+
+}
diff --git a/apps/settings/sub_menu/display_mode_controller.h b/apps/settings/sub_menu/display_mode_controller.h
new file mode 100644
index 000000000..f28724ace
--- /dev/null
+++ b/apps/settings/sub_menu/display_mode_controller.h
@@ -0,0 +1,26 @@
+#ifndef SETTINGS_DISPLAY_MODE_CONTROLLER_H
+#define SETTINGS_DISPLAY_MODE_CONTROLLER_H
+
+#include "preferences_controller.h"
+#include "../../shared/parameter_text_field_delegate.h"
+
+namespace Settings {
+
+class DisplayModeController : public PreferencesController, public Shared::ParameterTextFieldDelegate {
+public:
+  DisplayModeController(Responder * parentResponder);
+  HighlightCell * reusableCell(int index, int type) override;
+  int reusableCellCount(int type) override;
+  int typeAtLocation(int i, int j) override;
+  void willDisplayCellForIndex(HighlightCell * cell, int index) override;
+  bool textFieldShouldFinishEditing(TextField * textField, Ion::Events::Event event) override;
+  bool textFieldDidFinishEditing(TextField * textField, const char * text, Ion::Events::Event event) override;
+private:
+  Shared::TextFieldDelegateApp * textFieldDelegateApp() override;
+  MessageTableCellWithEditableText m_editableCell;
+  char m_draftTextBuffer[MessageTableCellWithEditableText::k_bufferLength];
+};
+
+}
+
+#endif
diff --git a/apps/settings/sub_menu/exam_mode_controller.cpp b/apps/settings/sub_menu/exam_mode_controller.cpp
new file mode 100644
index 000000000..6903add84
--- /dev/null
+++ b/apps/settings/sub_menu/exam_mode_controller.cpp
@@ -0,0 +1,52 @@
+#include "exam_mode_controller.h"
+#include "../../global_preferences.h"
+#include "../../apps_container.h"
+#include <assert.h>
+#include <cmath>
+
+using namespace Poincare;
+using namespace Shared;
+
+namespace Settings {
+
+ExamModeController::ExamModeController(Responder * parentResponder) :
+  GenericSubController(parentResponder),
+  m_cell(I18n::Message::ExamModeActive, KDText::FontSize::Large)
+{
+}
+
+void ExamModeController::didEnterResponderChain(Responder * previousFirstResponder) {
+  m_selectableTableView.reloadData();
+}
+
+bool ExamModeController::handleEvent(Ion::Events::Event event) {
+  if (event == Ion::Events::OK || event == Ion::Events::EXE) {
+    if (GlobalPreferences::sharedGlobalPreferences()->examMode() == GlobalPreferences::ExamMode::Activate) {
+      return false;
+    }
+    AppsContainer * container = (AppsContainer *)(app()->container());
+    container->displayExamModePopUp(true);
+    return true;
+  }
+  return GenericSubController::handleEvent(event);
+}
+
+HighlightCell * ExamModeController::reusableCell(int index, int type) {
+  assert(type == 0);
+  assert(index == 0);
+  return &m_cell;
+}
+
+int ExamModeController::reusableCellCount(int type) {
+  return 1;
+}
+
+void ExamModeController::willDisplayCellForIndex(HighlightCell * cell, int index) {
+  GenericSubController::willDisplayCellForIndex(cell, index);
+  if (GlobalPreferences::sharedGlobalPreferences()->examMode() == GlobalPreferences::ExamMode::Activate) {
+    MessageTableCell * myCell = (MessageTableCell *)cell;
+    myCell->setMessage(I18n::Message::ExamModeActive);
+  }
+}
+
+}
diff --git a/apps/settings/sub_menu/exam_mode_controller.h b/apps/settings/sub_menu/exam_mode_controller.h
new file mode 100644
index 000000000..22a0da0c7
--- /dev/null
+++ b/apps/settings/sub_menu/exam_mode_controller.h
@@ -0,0 +1,22 @@
+#ifndef SETTINGS_EXAM_MODE_CONTROLLER_H
+#define SETTINGS_EXAM_MODE_CONTROLLER_H
+
+#include "generic_sub_controller.h"
+
+namespace Settings {
+
+class ExamModeController : public GenericSubController {
+public:
+  ExamModeController(Responder * parentResponder);
+  void didEnterResponderChain(Responder * previousFirstResponder) override;
+  bool handleEvent(Ion::Events::Event event) override;
+  HighlightCell * reusableCell(int index, int type) override;
+  int reusableCellCount(int type) override;
+  void willDisplayCellForIndex(HighlightCell * cell, int index) override;
+private:
+  MessageTableCell m_cell;
+};
+
+}
+
+#endif
diff --git a/apps/settings/sub_menu/generic_sub_controller.cpp b/apps/settings/sub_menu/generic_sub_controller.cpp
new file mode 100644
index 000000000..e70e3f747
--- /dev/null
+++ b/apps/settings/sub_menu/generic_sub_controller.cpp
@@ -0,0 +1,92 @@
+#include "generic_sub_controller.h"
+#include "../../apps_container.h"
+#include <assert.h>
+#include <cmath>
+
+using namespace Poincare;
+using namespace Shared;
+
+namespace Settings {
+
+GenericSubController::GenericSubController(Responder * parentResponder) :
+  ViewController(parentResponder),
+  m_selectableTableView(this),
+  m_messageTreeModel(nullptr)
+{
+  m_selectableTableView.setTopMargin(k_topBottomMargin);
+  m_selectableTableView.setBottomMargin(k_topBottomMargin);
+}
+
+const char * GenericSubController::title() {
+  if (m_messageTreeModel) {
+    return I18n::translate(m_messageTreeModel->label());
+  }
+  return "";
+}
+
+View * GenericSubController::view() {
+  return &m_selectableTableView;
+}
+
+void GenericSubController::didBecomeFirstResponder() {
+  selectCellAtLocation(0, 0);
+  app()->setFirstResponder(&m_selectableTableView);
+}
+
+bool GenericSubController::handleEvent(Ion::Events::Event event) {
+  if (event == Ion::Events::Left) {
+    stackController()->pop();
+    return true;
+  }
+  return false;
+}
+
+int GenericSubController::numberOfRows() {
+  if (m_messageTreeModel) {
+    return m_messageTreeModel->numberOfChildren();
+  }
+  return 0;
+}
+
+KDCoordinate GenericSubController::rowHeight(int j) {
+  return Metric::ParameterCellHeight;
+}
+
+KDCoordinate GenericSubController::cumulatedHeightFromIndex(int j) {
+  return rowHeight(0) * j;
+}
+
+int GenericSubController::indexFromCumulatedHeight(KDCoordinate offsetY) {
+  KDCoordinate height = rowHeight(0);
+  if (height == 0) {
+    return 0;
+  }
+  return (offsetY - 1) / height;
+}
+
+int GenericSubController::typeAtLocation(int i, int j) {
+  return 0;
+}
+
+void GenericSubController::willDisplayCellForIndex(HighlightCell * cell, int index) {
+  MessageTableCell * myCell = (MessageTableCell *)cell;
+  myCell->setMessage(m_messageTreeModel->children(index)->label());
+}
+
+void GenericSubController::setMessageTreeModel(const MessageTree * messageTreeModel) {
+  m_messageTreeModel = (MessageTree *)messageTreeModel;
+}
+
+void GenericSubController::viewWillAppear() {
+  m_selectableTableView.reloadData();
+}
+
+void GenericSubController::viewDidDisappear() {
+  m_selectableTableView.deselectTable();
+}
+
+StackViewController * GenericSubController::stackController() const {
+  return (StackViewController *)parentResponder();
+}
+
+}
diff --git a/apps/settings/sub_menu/generic_sub_controller.h b/apps/settings/sub_menu/generic_sub_controller.h
new file mode 100644
index 000000000..1325de9a7
--- /dev/null
+++ b/apps/settings/sub_menu/generic_sub_controller.h
@@ -0,0 +1,34 @@
+#ifndef SETTINGS_GENERIC_SUB_CONTROLLER_H
+#define SETTINGS_GENERIC_SUB_CONTROLLER_H
+
+#include <escher.h>
+#include "../settings_message_tree.h"
+
+namespace Settings {
+
+class GenericSubController : public ViewController, public ListViewDataSource, public SelectableTableViewDataSource {
+public:
+  GenericSubController(Responder * parentResponder);
+  const char * title() override;
+  View * view() override;
+  void didBecomeFirstResponder() override;
+  bool handleEvent(Ion::Events::Event event) override;
+  int numberOfRows() override;
+  KDCoordinate rowHeight(int j) override;
+  KDCoordinate cumulatedHeightFromIndex(int j) override;
+  int indexFromCumulatedHeight(KDCoordinate offsetY) override;
+  int typeAtLocation(int i, int j) override;
+  void willDisplayCellForIndex(HighlightCell * cell, int index) override;
+  void setMessageTreeModel(const MessageTree * messageTreeModel);
+  void viewWillAppear() override;
+  void viewDidDisappear() override;
+protected:
+  StackViewController * stackController() const;
+  constexpr static KDCoordinate k_topBottomMargin = 13;
+  SelectableTableView m_selectableTableView;
+  MessageTree * m_messageTreeModel;
+};
+
+}
+
+#endif
diff --git a/apps/settings/language_controller.cpp b/apps/settings/sub_menu/language_controller.cpp
similarity index 100%
rename from apps/settings/language_controller.cpp
rename to apps/settings/sub_menu/language_controller.cpp
diff --git a/apps/settings/language_controller.h b/apps/settings/sub_menu/language_controller.h
similarity index 87%
rename from apps/settings/language_controller.h
rename to apps/settings/sub_menu/language_controller.h
index 92367959c..f552c9325 100644
--- a/apps/settings/language_controller.h
+++ b/apps/settings/sub_menu/language_controller.h
@@ -2,7 +2,7 @@
 #define SETTINGS_LANGUAGE_CONTROLLER_H
 
 #include <escher.h>
-#include "../shared/language_controller.h"
+#include "../../shared/language_controller.h"
 
 namespace Settings {
 
diff --git a/apps/settings/sub_menu/preferences_controller.cpp b/apps/settings/sub_menu/preferences_controller.cpp
new file mode 100644
index 000000000..680708a88
--- /dev/null
+++ b/apps/settings/sub_menu/preferences_controller.cpp
@@ -0,0 +1,127 @@
+#include "preferences_controller.h"
+#include "../../global_preferences.h"
+#include "../../apps_container.h"
+#include <assert.h>
+#include <cmath>
+
+using namespace Poincare;
+
+namespace Settings {
+
+PreferencesController::PreferencesController(Responder * parentResponder) :
+  GenericSubController(parentResponder)
+{
+  for (int i = 0; i < k_totalNumberOfCell; i++) {
+    m_cells[i].setMessageFontSize(KDText::FontSize::Large);
+  }
+}
+
+void PreferencesController::didBecomeFirstResponder() {
+  selectCellAtLocation(0, valueIndexForPreference(m_messageTreeModel->label()));
+  app()->setFirstResponder(&m_selectableTableView);
+}
+
+bool PreferencesController::handleEvent(Ion::Events::Event event) {
+  if (event == Ion::Events::OK || event == Ion::Events::EXE) {
+    /* Generic behaviour of preference menu*/
+    assert(m_messageTreeModel->label() != I18n::Message::DisplayMode || selectedRow() != numberOfRows()-1); // In that case, events OK and EXE are handled by the cell
+    setPreferenceWithValueIndex(m_messageTreeModel->label(), selectedRow());
+    AppsContainer * myContainer = (AppsContainer * )app()->container();
+    myContainer->refreshPreferences();
+    StackViewController * stack = stackController();
+    stack->pop();
+    return true;
+  }
+  return GenericSubController::handleEvent(event);
+}
+
+HighlightCell * PreferencesController::reusableCell(int index, int type) {
+  assert(type == 0);
+  assert(index >= 0 && index < k_totalNumberOfCell);
+  return &m_cells[index];
+}
+
+int PreferencesController::reusableCellCount(int type) {
+  return k_totalNumberOfCell;
+}
+
+Layout layoutForPreferences(I18n::Message message, int rowIndex) {
+  switch (message) {
+    case I18n::Message::AngleUnit:
+      return Layout();
+    case I18n::Message::DisplayMode:
+    {
+      if (rowIndex == 0) {
+        return LayoutHelper::String("12.34", 5, KDText::FontSize::Small);
+      }
+      const char text[] = {'1','.', '2', '3', '4', Ion::Charset::Exponent, '1'};
+      return LayoutHelper::String(text, sizeof(text), KDText::FontSize::Small);
+    }
+    case I18n::Message::EditionMode:
+    {
+      if (rowIndex == 0) {
+        return LayoutHelper::String("1+2/3", 5, KDText::FontSize::Small);
+      }
+      return HorizontalLayout(
+          LayoutHelper::String("1+", 2, KDText::FontSize::Small),
+          FractionLayout(LayoutHelper::String("2", 1, KDText::FontSize::Small), LayoutHelper::String("3", 1, KDText::FontSize::Small))
+          );
+
+    }
+    case I18n::Message::ComplexFormat:
+    {
+      if (rowIndex == 0) {
+        const char text[] = {'a','+', Ion::Charset::IComplex, 'b'};
+        return LayoutHelper::String(text, sizeof(text), KDText::FontSize::Small);
+      }
+      const char base[] = {'r', Ion::Charset::Exponential};
+      const char superscript[] = {Ion::Charset::IComplex, Ion::Charset::SmallTheta};
+      return HorizontalLayout(
+          LayoutHelper::String(base, sizeof(base), KDText::FontSize::Small),
+          VerticalOffsetLayout(LayoutHelper::String(superscript, sizeof(superscript), KDText::FontSize::Small), VerticalOffsetLayoutNode::Type::Superscript)
+          );
+    }
+    default:
+      assert(false);
+      return Layout();
+  }
+}
+
+void PreferencesController::willDisplayCellForIndex(HighlightCell * cell, int index) {
+  GenericSubController::willDisplayCellForIndex(cell, index);
+  MessageTableCellWithExpression * myCell = (MessageTableCellWithExpression *)cell;
+  myCell->setLayout(layoutForPreferences(m_messageTreeModel->label(), index));
+}
+
+void PreferencesController::setPreferenceWithValueIndex(I18n::Message message, int valueIndex) {
+  if (message == I18n::Message::AngleUnit) {
+    Preferences::sharedPreferences()->setAngleUnit((Preferences::AngleUnit)valueIndex);
+  }
+  if (message == I18n::Message::DisplayMode) {
+    Preferences::sharedPreferences()->setDisplayMode((Preferences::PrintFloatMode)valueIndex);
+  }
+  if (message == I18n::Message::EditionMode) {
+    Preferences::sharedPreferences()->setEditionMode((Preferences::EditionMode)valueIndex);
+  }
+  if (message == I18n::Message::ComplexFormat) {
+    Preferences::sharedPreferences()->setComplexFormat((Preferences::ComplexFormat)valueIndex);
+  }
+}
+
+int PreferencesController::valueIndexForPreference(I18n::Message message) {
+  if (message == I18n::Message::AngleUnit) {
+    return (int)Preferences::sharedPreferences()->angleUnit();
+  }
+  if (message == I18n::Message::DisplayMode) {
+    return (int)Preferences::sharedPreferences()->displayMode();
+  }
+  if (message == I18n::Message::EditionMode) {
+    return (int)Preferences::sharedPreferences()->editionMode();
+  }
+  if (message == I18n::Message::ComplexFormat) {
+    return (int)Preferences::sharedPreferences()->complexFormat();
+  }
+  return 0;
+}
+
+}
diff --git a/apps/settings/sub_menu/preferences_controller.h b/apps/settings/sub_menu/preferences_controller.h
new file mode 100644
index 000000000..05493caf0
--- /dev/null
+++ b/apps/settings/sub_menu/preferences_controller.h
@@ -0,0 +1,26 @@
+#ifndef SETTINGS_PREFERENCES_CONTROLLER_H
+#define SETTINGS_PREFERENCES_CONTROLLER_H
+
+#include "generic_sub_controller.h"
+
+namespace Settings {
+
+class PreferencesController : public GenericSubController {
+public:
+  PreferencesController(Responder * parentResponder);
+  void didBecomeFirstResponder() override;
+  bool handleEvent(Ion::Events::Event event) override;
+  HighlightCell * reusableCell(int index, int type) override;
+  int reusableCellCount(int type) override;
+  void willDisplayCellForIndex(HighlightCell * cell, int index) override;
+protected:
+  constexpr static int k_totalNumberOfCell = 2;
+private:
+  void setPreferenceWithValueIndex(I18n::Message message, int valueIndex);
+  int valueIndexForPreference(I18n::Message message);
+  MessageTableCellWithExpression m_cells[k_totalNumberOfCell];
+};
+
+}
+
+#endif