diff --git a/Packages/com.unity.inputsystem/CHANGELOG.md b/Packages/com.unity.inputsystem/CHANGELOG.md
index 865e7ba999..1b5a0f7e73 100644
--- a/Packages/com.unity.inputsystem/CHANGELOG.md
+++ b/Packages/com.unity.inputsystem/CHANGELOG.md
@@ -30,6 +30,7 @@ however, it has to be formatted properly to pass verification tests.
 - Fixed tooltip support in the UI Toolkit version of the Input Actions Asset editor.
 - Fixed documentation to clarify bindings with modifiers `overrideModifiersNeedToBePressedFirst` configuration [ISXB-806](https://issuetracker.unity3d.com/product/unity/issues/guid/ISXB-806).
 - Fixed an issue in `Samples/Visualizers/GamepadVisualizer.unity` sample where the visualization wouldn't handle device disconnects or current device changes properly (ISXB-1243).
+- Fixed an issue when displaying Serialized InputAction's Processor properties inside the Inspector window. [ISXB-1269](https://issuetracker.unity3d.com/product/unity/issues/guid/ISXB-1269)
 
 ### Changed
 - Added back the InputManager to InputSystem project-wide asset migration code with performance improvement (ISX-2086).
@@ -37,6 +38,9 @@ however, it has to be formatted properly to pass verification tests.
 - Changed paremeter `overrideModifiersNeedToBePressedFirst` to obsolete for `ButtonWithOneModifier`, `ButtonWithTwoModifiers`, `OneModifierComposite` and `TwoModifiersComposite` in favour the new `modifiersOrder` parameter which is more explicit.
 - Changed `Samples/Visualizers/GamepadVisualizer.unity` to visualize the control values of the current device instead of the first device.
 
+### Added
+- Added new API `InputSystem.settings.useIMGUIEditorForAssets` that should be used in custom `InputParameterEditor` that use both IMGUI and UI Toolkit.
+
 ## [1.11.2] - 2024-10-16
 
 ### Fixed
diff --git a/Packages/com.unity.inputsystem/InputSystem/Actions/Composites/AxisComposite.cs b/Packages/com.unity.inputsystem/InputSystem/Actions/Composites/AxisComposite.cs
index 9c9074e406..48ae2a7c0e 100644
--- a/Packages/com.unity.inputsystem/InputSystem/Actions/Composites/AxisComposite.cs
+++ b/Packages/com.unity.inputsystem/InputSystem/Actions/Composites/AxisComposite.cs
@@ -220,7 +220,7 @@ internal class AxisCompositeEditor : InputParameterEditor<AxisComposite>
         public override void OnGUI()
         {
 #if UNITY_INPUT_SYSTEM_PROJECT_WIDE_ACTIONS
-            if (!InputSystem.settings.IsFeatureEnabled(InputFeatureNames.kUseIMGUIEditorForAssets)) return;
+            if (!InputSystem.settings.useIMGUIEditorForAssets) return;
 #endif
             target.whichSideWins = (AxisComposite.WhichSideWins)EditorGUILayout.EnumPopup(m_WhichAxisWinsLabel, target.whichSideWins);
         }
diff --git a/Packages/com.unity.inputsystem/InputSystem/Actions/Composites/Vector2Composite.cs b/Packages/com.unity.inputsystem/InputSystem/Actions/Composites/Vector2Composite.cs
index 0d01a73b3d..2f970dda8b 100644
--- a/Packages/com.unity.inputsystem/InputSystem/Actions/Composites/Vector2Composite.cs
+++ b/Packages/com.unity.inputsystem/InputSystem/Actions/Composites/Vector2Composite.cs
@@ -200,7 +200,7 @@ internal class Vector2CompositeEditor : InputParameterEditor<Vector2Composite>
         public override void OnGUI()
         {
 #if UNITY_INPUT_SYSTEM_PROJECT_WIDE_ACTIONS
-            if (!InputSystem.settings.IsFeatureEnabled(InputFeatureNames.kUseIMGUIEditorForAssets)) return;
+            if (!InputSystem.settings.useIMGUIEditorForAssets) return;
 #endif
             target.mode = (Vector2Composite.Mode)EditorGUILayout.EnumPopup(m_ModeLabel, target.mode);
         }
diff --git a/Packages/com.unity.inputsystem/InputSystem/Actions/Composites/Vector3Composite.cs b/Packages/com.unity.inputsystem/InputSystem/Actions/Composites/Vector3Composite.cs
index 0e2626e4b1..d9a0e510c4 100644
--- a/Packages/com.unity.inputsystem/InputSystem/Actions/Composites/Vector3Composite.cs
+++ b/Packages/com.unity.inputsystem/InputSystem/Actions/Composites/Vector3Composite.cs
@@ -180,7 +180,7 @@ internal class Vector3CompositeEditor : InputParameterEditor<Vector3Composite>
         public override void OnGUI()
         {
 #if UNITY_INPUT_SYSTEM_PROJECT_WIDE_ACTIONS
-            if (!InputSystem.settings.IsFeatureEnabled(InputFeatureNames.kUseIMGUIEditorForAssets)) return;
+            if (!InputSystem.settings.useIMGUIEditorForAssets) return;
 #endif
             target.mode = (Vector3Composite.Mode)EditorGUILayout.EnumPopup(m_ModeLabel, target.mode);
         }
diff --git a/Packages/com.unity.inputsystem/InputSystem/Actions/Interactions/HoldInteraction.cs b/Packages/com.unity.inputsystem/InputSystem/Actions/Interactions/HoldInteraction.cs
index d05942b07c..79e057da25 100644
--- a/Packages/com.unity.inputsystem/InputSystem/Actions/Interactions/HoldInteraction.cs
+++ b/Packages/com.unity.inputsystem/InputSystem/Actions/Interactions/HoldInteraction.cs
@@ -125,7 +125,7 @@ protected override void OnEnable()
         public override void OnGUI()
         {
 #if UNITY_INPUT_SYSTEM_PROJECT_WIDE_ACTIONS
-            if (!InputSystem.settings.IsFeatureEnabled(InputFeatureNames.kUseIMGUIEditorForAssets)) return;
+            if (!InputSystem.settings.useIMGUIEditorForAssets) return;
 #endif
             m_PressPointSetting.OnGUI();
             m_DurationSetting.OnGUI();
diff --git a/Packages/com.unity.inputsystem/InputSystem/Actions/Interactions/MultiTapInteraction.cs b/Packages/com.unity.inputsystem/InputSystem/Actions/Interactions/MultiTapInteraction.cs
index 8e5c3f142b..35768ca1b5 100644
--- a/Packages/com.unity.inputsystem/InputSystem/Actions/Interactions/MultiTapInteraction.cs
+++ b/Packages/com.unity.inputsystem/InputSystem/Actions/Interactions/MultiTapInteraction.cs
@@ -197,7 +197,7 @@ protected override void OnEnable()
         public override void OnGUI()
         {
 #if UNITY_INPUT_SYSTEM_PROJECT_WIDE_ACTIONS
-            if (!InputSystem.settings.IsFeatureEnabled(InputFeatureNames.kUseIMGUIEditorForAssets)) return;
+            if (!InputSystem.settings.useIMGUIEditorForAssets) return;
 #endif
             target.tapCount = EditorGUILayout.IntField(m_TapCountLabel, target.tapCount);
             m_TapDelaySetting.OnGUI();
diff --git a/Packages/com.unity.inputsystem/InputSystem/Actions/Interactions/PressInteraction.cs b/Packages/com.unity.inputsystem/InputSystem/Actions/Interactions/PressInteraction.cs
index 136e6e5165..33cdb0bc79 100644
--- a/Packages/com.unity.inputsystem/InputSystem/Actions/Interactions/PressInteraction.cs
+++ b/Packages/com.unity.inputsystem/InputSystem/Actions/Interactions/PressInteraction.cs
@@ -214,7 +214,7 @@ protected override void OnEnable()
         public override void OnGUI()
         {
 #if UNITY_INPUT_SYSTEM_PROJECT_WIDE_ACTIONS
-            if (!InputSystem.settings.IsFeatureEnabled(InputFeatureNames.kUseIMGUIEditorForAssets)) return;
+            if (!InputSystem.settings.useIMGUIEditorForAssets) return;
 #endif
             EditorGUILayout.HelpBox(s_HelpBoxText);
             target.behavior = (PressBehavior)EditorGUILayout.EnumPopup(s_PressBehaviorLabel, target.behavior);
diff --git a/Packages/com.unity.inputsystem/InputSystem/Actions/Interactions/SlowTapInteraction.cs b/Packages/com.unity.inputsystem/InputSystem/Actions/Interactions/SlowTapInteraction.cs
index a4c41fe22e..5309ab7a5d 100644
--- a/Packages/com.unity.inputsystem/InputSystem/Actions/Interactions/SlowTapInteraction.cs
+++ b/Packages/com.unity.inputsystem/InputSystem/Actions/Interactions/SlowTapInteraction.cs
@@ -89,7 +89,7 @@ protected override void OnEnable()
         public override void OnGUI()
         {
 #if UNITY_INPUT_SYSTEM_PROJECT_WIDE_ACTIONS
-            if (!InputSystem.settings.IsFeatureEnabled(InputFeatureNames.kUseIMGUIEditorForAssets)) return;
+            if (!InputSystem.settings.useIMGUIEditorForAssets) return;
 #endif
             m_DurationSetting.OnGUI();
             m_PressPointSetting.OnGUI();
diff --git a/Packages/com.unity.inputsystem/InputSystem/Actions/Interactions/TapInteraction.cs b/Packages/com.unity.inputsystem/InputSystem/Actions/Interactions/TapInteraction.cs
index b5079ca044..b76a78073f 100644
--- a/Packages/com.unity.inputsystem/InputSystem/Actions/Interactions/TapInteraction.cs
+++ b/Packages/com.unity.inputsystem/InputSystem/Actions/Interactions/TapInteraction.cs
@@ -103,7 +103,7 @@ protected override void OnEnable()
         public override void OnGUI()
         {
 #if UNITY_INPUT_SYSTEM_PROJECT_WIDE_ACTIONS
-            if (!InputSystem.settings.IsFeatureEnabled(InputFeatureNames.kUseIMGUIEditorForAssets)) return;
+            if (!InputSystem.settings.useIMGUIEditorForAssets) return;
 #endif
             m_DurationSetting.OnGUI();
             m_PressPointSetting.OnGUI();
diff --git a/Packages/com.unity.inputsystem/InputSystem/Controls/Processors/AxisDeadzoneProcessor.cs b/Packages/com.unity.inputsystem/InputSystem/Controls/Processors/AxisDeadzoneProcessor.cs
index 88881ab698..d9c33718a4 100644
--- a/Packages/com.unity.inputsystem/InputSystem/Controls/Processors/AxisDeadzoneProcessor.cs
+++ b/Packages/com.unity.inputsystem/InputSystem/Controls/Processors/AxisDeadzoneProcessor.cs
@@ -94,7 +94,7 @@ protected override void OnEnable()
         public override void OnGUI()
         {
 #if UNITY_INPUT_SYSTEM_PROJECT_WIDE_ACTIONS
-            if (!InputSystem.settings.IsFeatureEnabled(InputFeatureNames.kUseIMGUIEditorForAssets)) return;
+            if (!InputSystem.settings.useIMGUIEditorForAssets) return;
 #endif
             m_MinSetting.OnGUI();
             m_MaxSetting.OnGUI();
diff --git a/Packages/com.unity.inputsystem/InputSystem/Controls/Processors/StickDeadzoneProcessor.cs b/Packages/com.unity.inputsystem/InputSystem/Controls/Processors/StickDeadzoneProcessor.cs
index 63bfd1873b..b0115b977b 100644
--- a/Packages/com.unity.inputsystem/InputSystem/Controls/Processors/StickDeadzoneProcessor.cs
+++ b/Packages/com.unity.inputsystem/InputSystem/Controls/Processors/StickDeadzoneProcessor.cs
@@ -83,7 +83,7 @@ protected override void OnEnable()
         public override void OnGUI()
         {
 #if UNITY_INPUT_SYSTEM_PROJECT_WIDE_ACTIONS
-            if (!InputSystem.settings.IsFeatureEnabled(InputFeatureNames.kUseIMGUIEditorForAssets)) return;
+            if (!InputSystem.settings.useIMGUIEditorForAssets) return;
 #endif
             m_MinSetting.OnGUI();
             m_MaxSetting.OnGUI();
diff --git a/Packages/com.unity.inputsystem/InputSystem/Editor/AssetEditor/InputActionEditorWindow.cs b/Packages/com.unity.inputsystem/InputSystem/Editor/AssetEditor/InputActionEditorWindow.cs
index f3fcc1ab33..2aa6a7d990 100644
--- a/Packages/com.unity.inputsystem/InputSystem/Editor/AssetEditor/InputActionEditorWindow.cs
+++ b/Packages/com.unity.inputsystem/InputSystem/Editor/AssetEditor/InputActionEditorWindow.cs
@@ -45,7 +45,7 @@ static InputActionEditorWindow()
         public static bool OnOpenAsset(int instanceId, int line)
         {
 #if UNITY_INPUT_SYSTEM_PROJECT_WIDE_ACTIONS
-            if (!InputSystem.settings.IsFeatureEnabled(InputFeatureNames.kUseIMGUIEditorForAssets))
+            if (!InputSystem.settings.useIMGUIEditorForAssets)
                 return false;
 #endif
             var path = AssetDatabase.GetAssetPath(instanceId);
diff --git a/Packages/com.unity.inputsystem/InputSystem/Editor/AssetEditor/ParameterListView.cs b/Packages/com.unity.inputsystem/InputSystem/Editor/AssetEditor/ParameterListView.cs
index e3d9a8a978..4e1df4bb84 100644
--- a/Packages/com.unity.inputsystem/InputSystem/Editor/AssetEditor/ParameterListView.cs
+++ b/Packages/com.unity.inputsystem/InputSystem/Editor/AssetEditor/ParameterListView.cs
@@ -353,7 +353,7 @@ public void OnGUI()
 
 #if UNITY_INPUT_SYSTEM_PROJECT_WIDE_ACTIONS
             // handled by OnDrawVisualElements with UI Toolkit
-            if (!InputSystem.settings.IsFeatureEnabled(InputFeatureNames.kUseIMGUIEditorForAssets)) return;
+            if (!InputSystem.settings.useIMGUIEditorForAssets) return;
 #endif
             // Otherwise, fall back to our default logic.
             if (m_Parameters == null)
diff --git a/Packages/com.unity.inputsystem/InputSystem/Editor/AssetImporter/InputActionImporterEditor.cs b/Packages/com.unity.inputsystem/InputSystem/Editor/AssetImporter/InputActionImporterEditor.cs
index f13391c2e2..74244994c8 100644
--- a/Packages/com.unity.inputsystem/InputSystem/Editor/AssetImporter/InputActionImporterEditor.cs
+++ b/Packages/com.unity.inputsystem/InputSystem/Editor/AssetImporter/InputActionImporterEditor.cs
@@ -150,7 +150,7 @@ private static void OpenEditor(InputActionAsset asset)
             }
 
             // Redirect to UI-Toolkit window editor if not configured to use IMGUI explicitly
-            if (!InputSystem.settings.IsFeatureEnabled(InputFeatureNames.kUseIMGUIEditorForAssets))
+            if (!InputSystem.settings.useIMGUIEditorForAssets)
                 InputActionsEditorWindow.OpenEditor(asset);
             else
                 InputActionEditorWindow.OpenEditor(asset);
diff --git a/Packages/com.unity.inputsystem/InputSystem/Editor/PropertyDrawers/InputActionDrawerBase.cs b/Packages/com.unity.inputsystem/InputSystem/Editor/PropertyDrawers/InputActionDrawerBase.cs
index a817161c6c..06d2df3fe5 100644
--- a/Packages/com.unity.inputsystem/InputSystem/Editor/PropertyDrawers/InputActionDrawerBase.cs
+++ b/Packages/com.unity.inputsystem/InputSystem/Editor/PropertyDrawers/InputActionDrawerBase.cs
@@ -180,9 +180,12 @@ public static void Show(Rect btnRect, PropertiesViewBase view)
                 window.ShowAsDropDown(btnRect, new Vector2(300, 350));
             }
 
+            private Vector2 m_ScrollPos;
             private void OnGUI()
             {
+                m_ScrollPos = EditorGUILayout.BeginScrollView(m_ScrollPos);
                 m_PropertyView.OnGUI();
+                EditorGUILayout.EndScrollView();
             }
 
             private PropertiesViewBase m_PropertyView;
diff --git a/Packages/com.unity.inputsystem/InputSystem/InputSettings.cs b/Packages/com.unity.inputsystem/InputSystem/InputSettings.cs
index 4ee37718d9..bed8bddbc3 100644
--- a/Packages/com.unity.inputsystem/InputSystem/InputSettings.cs
+++ b/Packages/com.unity.inputsystem/InputSystem/InputSettings.cs
@@ -978,6 +978,17 @@ public enum InputActionPropertyDrawerMode
             MultilineBoth,
         }
 
+#if UNITY_EDITOR && UNITY_INPUT_SYSTEM_PROJECT_WIDE_ACTIONS
+        /// <summary>
+        /// Determines if we should render the UI with IMGUI even if an UI Toolkit UI is available.
+        ///
+        /// This should be used when writing a custom <see cref="InputParameterEditor"/> to :
+        /// * support inspector view which only work in IMGUI for now.
+        /// * prevent the UI to be rendered in IMGUI and UI Toolkit in the Input Actions Editor window.
+        /// </summary>
+        public bool useIMGUIEditorForAssets => UnityEditor.EditorGUI.indentLevel > 0 || IsFeatureEnabled(InputFeatureNames.kUseIMGUIEditorForAssets);
+#endif
+
         private static bool CompareFloats(float a, float b)
         {
             return (a - b) <= float.Epsilon;