diff --git a/companion/src/firmwares/customisation_data.cpp b/companion/src/firmwares/customisation_data.cpp
index deda4a21c..d5bea24b2 100644
--- a/companion/src/firmwares/customisation_data.cpp
+++ b/companion/src/firmwares/customisation_data.cpp
@@ -20,6 +20,8 @@
  */
 
 #include "customisation_data.h"
+#include "eeprominterface.h"
+#include "helpers.h"
 
 // cannot use QColor so use formula from libopenui_defines.h
 #define RADIO_RGB(r, g, b) \
@@ -27,6 +29,22 @@
 #define WHITE RADIO_RGB(0xFF, 0xFF, 0xFF)
 #define RED RADIO_RGB(229, 32, 30)
 
+// based on radio/src/gui/colorlcd/libui/etx_lv_theme.h
+int layoutValueScaled(int value)
+{
+  Firmware *firmware = getCurrentFirmware();
+  Board::Type board = firmware->getBoard();
+
+  if (firmware->getCapability(IsLandscape)) {
+    if (Boards::getCapability(board, Board::LcdWidth) == 320)
+      return ((value * 8 + 5) / 10);
+    else if (Boards::getCapability(board, Board::LcdWidth) == 800)
+      return ((value * 11 + 4) / 8);
+  }
+
+  return value;
+}
+
 ZoneOptionValue::ZoneOptionValue()
 {
   clear();
@@ -262,3 +280,14 @@ void RadioLayout::init(const std::string layoutId, CustomScreens& customScreens)
     setZoneOptionValue(persistentData.options[j++].value, (bool)false);
   }
 }
+
+// based on radio/src/gui/colorlcd/mainview/datastructs_screen.h
+int RadioLayout::topBarZones()
+{
+  Firmware *firmware = getCurrentFirmware();
+  Board::Type board = firmware->getBoard();
+  const int menuHeaderButtonsLeft = layoutValueScaled(47);
+  const int topBarZoneWidth = layoutValueScaled((firmware->getCapability(IsWideLayout) ? 74 : 70));
+  return rangeCheck(((Boards::getCapability(board, Board::LcdWidth) - menuHeaderButtonsLeft - 1 +
+          topBarZoneWidth / 2) / topBarZoneWidth), 0, MAX_TOPBAR_ZONES, 0);
+}
diff --git a/companion/src/firmwares/customisation_data.h b/companion/src/firmwares/customisation_data.h
index 2d01653b4..4c01db981 100644
--- a/companion/src/firmwares/customisation_data.h
+++ b/companion/src/firmwares/customisation_data.h
@@ -191,4 +191,5 @@ class RadioLayout
     };
 
     static void init(const std::string layoutId, CustomScreens & customScreens);
+    static int topBarZones();
 };
diff --git a/companion/src/firmwares/edgetx/yaml_modeldata.cpp b/companion/src/firmwares/edgetx/yaml_modeldata.cpp
index 1c76b52da..490cc0c0e 100644
--- a/companion/src/firmwares/edgetx/yaml_modeldata.cpp
+++ b/companion/src/firmwares/edgetx/yaml_modeldata.cpp
@@ -1029,7 +1029,8 @@ Node convert<ModelData>::encode(const ModelData& rhs)
   modelSettingsVersion = SemanticVersion(VERSION);
 
   Node node;
-  auto board = getCurrentBoard();
+  auto firmware = getCurrentFirmware();
+  auto board = firmware->getBoard();
 
   bool hasColorLcd = Boards::getCapability(board, Board::HasColorLcd);
 
@@ -1242,8 +1243,8 @@ Node convert<ModelData>::encode(const ModelData& rhs)
     node["toplcdTimer"] = rhs.toplcdTimer;
   }
 
-  if (IS_FAMILY_HORUS_OR_T16(board)) {
-    for (int i=0; i<MAX_CUSTOM_SCREENS; i++) {
+  if (Boards::getCapability(board, Board::HasColorLcd)) {
+    for (int i = 0; i < MAX_CUSTOM_SCREENS; i++) {
       const auto& csd = rhs.customScreens.customScreenData[i];
       if (!csd.isEmpty()) {
         node["screenData"][std::to_string(i)] = csd;
@@ -1254,9 +1255,11 @@ Node convert<ModelData>::encode(const ModelData& rhs)
     if (topbarData && topbarData.IsMap()) {
       node["topbarData"] = topbarData;
     }
-    for (int i = 0; i < MAX_TOPBAR_ZONES; i++)
-      if (rhs.topbarWidgetWidth[i] > 0)
+    for (int i = 0; i < firmware->getCapability(TopBarZones); i++) {
+      if (rhs.topbarWidgetWidth[i] > 0) {
         node["topbarWidgetWidth"][std::to_string(i)]["val"] = (int)rhs.topbarWidgetWidth[i];
+      }
+    }
     node["view"] = rhs.view;
   }
 
@@ -1311,7 +1314,8 @@ bool convert<ModelData>::decode(const Node& node, ModelData& rhs)
 {
   if (!node.IsMap()) return false;
 
-  Board::Type board = getCurrentBoard();
+  auto firmware = getCurrentFirmware();
+  auto board = firmware->getBoard();
 
   unsigned int modelIds[CPN_MAX_MODULES];
   memset(modelIds, 0, sizeof(modelIds));
@@ -1663,6 +1667,22 @@ bool convert<ModelData>::decode(const Node& node, ModelData& rhs)
   YamlValidateLabelsNames(rhs, board);
   rhs.sortMixes();  // critical for Companion and radio that mix lines are in sequence
 
+  //  TODO move to model conversion so any changes reported
+  if (Boards::getCapability(board, Board::HasColorLcd)) {
+    // total width of topbar widgets cannot exceed firmware topbar zones
+    const int fwzones = firmware->getCapability(TopBarZones);
+    int usedzones = 0;
+
+    for (int i = 0; i < MAX_TOPBAR_ZONES; i++) {
+      usedzones += rhs.topbarWidgetWidth[i];
+
+      if (usedzones > fwzones) {
+        rhs.topbarWidgetWidth[i] = 0;
+        rhs.topBarData.zones[i].clear();
+      }
+    }
+  }
+
   return true;
 }
 
diff --git a/companion/src/firmwares/eeprominterface.h b/companion/src/firmwares/eeprominterface.h
index 6a14530ab..347c40272 100644
--- a/companion/src/firmwares/eeprominterface.h
+++ b/companion/src/firmwares/eeprominterface.h
@@ -76,6 +76,10 @@ enum Capability {
   HasVarioSink,
   Heli,
   InputsLength,
+  IsLandscape,
+  IsNarrowLayout,
+  IsPortrait,
+  IsWideLayout,
   KeyShortcuts,
   LogicalSwitches,
   LuaInputsPerScript,
diff --git a/companion/src/firmwares/modeldata.cpp b/companion/src/firmwares/modeldata.cpp
index 7926905c8..67ee20b2e 100644
--- a/companion/src/firmwares/modeldata.cpp
+++ b/companion/src/firmwares/modeldata.cpp
@@ -312,7 +312,7 @@ void ModelData::clear()
   topBarData.clear();
 
   for (int i = 0; i < MAX_TOPBAR_ZONES; i++)
-    topbarWidgetWidth[i] = 0;
+    topbarWidgetWidth[i] = 1;
 
   view = 0;
   memset(&registrationId, 0, sizeof(registrationId));
@@ -414,9 +414,11 @@ void ModelData::setDefaultValues(unsigned int id, const GeneralSettings & settin
   clear();
   used = true;
   sprintf(name, "MODEL%02d", id + 1);
+
   for (int i = 0; i < CPN_MAX_MODULES; i++) {
     moduleData[i].modelId = id + 1;
   }
+
   setDefaultMixes(settings);
   setDefaultFunctionSwitches(Boards::getCapability(getCurrentFirmware()->getBoard(), Board::FunctionSwitches));
 }
diff --git a/companion/src/firmwares/opentx/opentxinterface.cpp b/companion/src/firmwares/opentx/opentxinterface.cpp
index 513767455..aa3ca0bcb 100644
--- a/companion/src/firmwares/opentx/opentxinterface.cpp
+++ b/companion/src/firmwares/opentx/opentxinterface.cpp
@@ -22,6 +22,7 @@
 #include "opentxinterface.h"
 #include "appdata.h"
 #include "constants.h"
+#include "customisation_data.h"
 
 #include <bitset>
 #include <QMessageBox>
@@ -130,6 +131,16 @@ int OpenTxFirmware::getCapability(::Capability capability)
         return !id.contains("noheli");
     case InputsLength:
       return HAS_LARGE_LCD(board) ? 4 : 3;
+    case IsLandscape:
+      return Boards::getCapability(board, Board::LcdWidth) > Boards::getCapability(board, Board::LcdHeight);
+    case IsNarrowLayout:
+      // based on radio/src/gui/colorlcd/libui/etx_lv_theme.h
+      return (getCapability(IsPortrait) && Boards::getCapability(board, Board::LcdWidth) == 320);
+    case IsPortrait:
+      return !getCapability(IsLandscape);
+    case IsWideLayout:
+      // based on radio/src/gui/colorlcd/libui/etx_lv_theme.h
+      return (!getCapability(IsNarrowLayout) && Boards::getCapability(board, Board::LcdWidth) >= 800);
     case KeyShortcuts:
       return VERSION_MAJOR > 2 && Boards::getCapability(board, Board::HasColorLcd) ? MAX_KEYSHORTCUTS : 0;
     case LogicalSwitches:
@@ -207,7 +218,7 @@ int OpenTxFirmware::getCapability(::Capability capability)
       else
         return 3;
     case TopBarZones:
-      return Boards::getCapability(board, Board::LcdWidth) > Boards::getCapability(board, Board::LcdHeight) ? 4 : 2;
+      return Boards::getCapability(board, Board::HasColorLcd) ? RadioLayout::topBarZones() : 0;
     case TrainerInputs:
       return 16;
     case TrimsRange:
diff --git a/companion/src/helpers.h b/companion/src/helpers.h
index b59a86d85..56552b085 100644
--- a/companion/src/helpers.h
+++ b/companion/src/helpers.h
@@ -268,3 +268,11 @@ class StatusDialog: public QDialog
   private:
     QLabel *msg;
 };
+
+template <typename T>
+T rangeCheck(T value, T min, T max, T defaultValue) {
+  if (value < min || value > max) {
+      return defaultValue;
+  }
+  return value;
+}
diff --git a/companion/src/modeledit/colorcustomscreens.cpp b/companion/src/modeledit/colorcustomscreens.cpp
index 3b6a94c21..0a356a078 100644
--- a/companion/src/modeledit/colorcustomscreens.cpp
+++ b/companion/src/modeledit/colorcustomscreens.cpp
@@ -147,7 +147,12 @@ UserInterfacePanel::UserInterfacePanel(QWidget * parent, ModelData & model, Gene
 
   QGridLayout * tbgrid = new QGridLayout();
 
-  for (int i = 0; i < firmware->getCapability(TopBarZones); i++) {
+  const int zones = firmware->getCapability(TopBarZones);
+  int usedzones = 0;
+
+  for (int i = 0; i < zones; i++) {
+    if (usedzones >= zones) break;
+    usedzones += model.topbarWidgetWidth[i];
     ZonePersistentData & zpd = model.topBarData.zones[i];
     QPushButton * btn = new QPushButton(zpd.widgetName.c_str(), this);
     btn->setProperty("index", i);