diff --git a/Source/Editor/CustomEditors/Editors/FlaxObjectRefEditor.cs b/Source/Editor/CustomEditors/Editors/FlaxObjectRefEditor.cs
index 4420d3fca..7412ca4dc 100644
--- a/Source/Editor/CustomEditors/Editors/FlaxObjectRefEditor.cs
+++ b/Source/Editor/CustomEditors/Editors/FlaxObjectRefEditor.cs
@@ -18,6 +18,7 @@ namespace FlaxEditor.CustomEditors.Editors
     /// A custom control type used to pick reference to <see cref="FlaxEngine.Object"/>.
     /// </summary>
     /// <seealso cref="FlaxEngine.GUI.Control" />
+    [HideInEditor]
     public class FlaxObjectRefPickerControl : Control
     {
         private ScriptType _type;
diff --git a/Source/Editor/GUI/Drag/DragHelper.cs b/Source/Editor/GUI/Drag/DragHelper.cs
index 37c6c2ab5..ca4974931 100644
--- a/Source/Editor/GUI/Drag/DragHelper.cs
+++ b/Source/Editor/GUI/Drag/DragHelper.cs
@@ -10,6 +10,7 @@ namespace FlaxEditor.GUI.Drag
     /// <summary>
     /// The drag events helper object.
     /// </summary>
+    [HideInEditor]
     public abstract class DragHelper
     {
         /// <summary>
diff --git a/Source/Editor/GUI/Tabs/Tab.cs b/Source/Editor/GUI/Tabs/Tab.cs
index 91025deac..d95e85714 100644
--- a/Source/Editor/GUI/Tabs/Tab.cs
+++ b/Source/Editor/GUI/Tabs/Tab.cs
@@ -10,6 +10,7 @@ namespace FlaxEditor.GUI.Tabs
     /// Single tab control used by <see cref="Tabs"/>.
     /// </summary>
     /// <seealso cref="FlaxEngine.GUI.ContainerControl" />
+    [HideInEditor]
     public class Tab : ContainerControl
     {
         /// <summary>
diff --git a/Source/Editor/Surface/SurfaceNode.cs b/Source/Editor/Surface/SurfaceNode.cs
index ff1d376e7..79fa2968a 100644
--- a/Source/Editor/Surface/SurfaceNode.cs
+++ b/Source/Editor/Surface/SurfaceNode.cs
@@ -13,6 +13,7 @@ namespace FlaxEditor.Surface
     /// <summary>
     /// The surface breakpoint data for debugger.
     /// </summary>
+    [HideInEditor]
     public struct SurfaceBreakpoint
     {
         /// <summary>
diff --git a/Source/Editor/Tools/Foliage/Brush.cs b/Source/Editor/Tools/Foliage/Brush.cs
index da71f0d43..67de53b85 100644
--- a/Source/Editor/Tools/Foliage/Brush.cs
+++ b/Source/Editor/Tools/Foliage/Brush.cs
@@ -7,6 +7,7 @@ namespace FlaxEditor.Tools.Foliage
     /// <summary>
     /// Foliage painting brush.
     /// </summary>
+    [HideInEditor]
     public class Brush
     {
         /// <summary>
diff --git a/Source/Editor/Tools/Foliage/Undo/EditFoliageAction.cs b/Source/Editor/Tools/Foliage/Undo/EditFoliageAction.cs
index 7cd5c40e2..5f951e6e8 100644
--- a/Source/Editor/Tools/Foliage/Undo/EditFoliageAction.cs
+++ b/Source/Editor/Tools/Foliage/Undo/EditFoliageAction.cs
@@ -9,7 +9,7 @@ namespace FlaxEditor.Tools.Foliage.Undo
     /// The foliage editing action that records before and after states to swap between unmodified and modified foliage data.
     /// </summary>
     /// <seealso cref="FlaxEditor.IUndoAction" />
-    [Serializable]
+    [Serializable, HideInEditor]
     public sealed class EditFoliageAction : IUndoAction
     {
         [Serialize]
diff --git a/Source/Editor/Undo/Actions/EditSplineAction.cs b/Source/Editor/Undo/Actions/EditSplineAction.cs
index 7fb836459..4f21cc149 100644
--- a/Source/Editor/Undo/Actions/EditSplineAction.cs
+++ b/Source/Editor/Undo/Actions/EditSplineAction.cs
@@ -12,7 +12,7 @@ namespace FlaxEditor.Actions
     /// </summary>
     /// <seealso cref="FlaxEditor.IUndoAction" />
     /// <seealso cref="FlaxEditor.ISceneEditAction" />
-    [Serializable]
+    [Serializable, HideInEditor]
     public class EditSplineAction : IUndoAction, ISceneEditAction
     {
         [Serialize]
diff --git a/Source/Editor/Viewport/Previews/AudioClipPreview.cs b/Source/Editor/Viewport/Previews/AudioClipPreview.cs
index 99c56c711..9428a2e3f 100644
--- a/Source/Editor/Viewport/Previews/AudioClipPreview.cs
+++ b/Source/Editor/Viewport/Previews/AudioClipPreview.cs
@@ -11,6 +11,7 @@ namespace FlaxEditor.Viewport.Previews
     /// Audio clip PCM data editor preview.
     /// </summary>
     /// <seealso cref="FlaxEngine.GUI.ContainerControl" />
+    [HideInEditor]
     public class AudioClipPreview : ContainerControl
     {
         /// <summary>
diff --git a/Source/Editor/Windows/GameCookerWindow.cs b/Source/Editor/Windows/GameCookerWindow.cs
index 855a0d661..e288553d7 100644
--- a/Source/Editor/Windows/GameCookerWindow.cs
+++ b/Source/Editor/Windows/GameCookerWindow.cs
@@ -34,7 +34,7 @@ namespace FlaxEditor.Windows
             public readonly GameCookerWindow GameCookerWin;
             public readonly PlatformSelector Selector;
 
-            public readonly Dictionary<PlatformType, Platform> PerPlatformOptions = new Dictionary<PlatformType, Platform>
+            private readonly Dictionary<PlatformType, Platform> PerPlatformOptions = new Dictionary<PlatformType, Platform>
             {
                 { PlatformType.Windows, new Windows() },
                 { PlatformType.XboxOne, new XboxOne() },
@@ -61,7 +61,7 @@ namespace FlaxEditor.Windows
                 PerPlatformOptions[PlatformType.Switch].Init("Output/Switch", "Switch");
             }
 
-            public abstract class Platform
+            abstract class Platform
             {
                 [HideInEditor]
                 public bool IsSupported;
@@ -155,47 +155,47 @@ namespace FlaxEditor.Windows
                 }
             }
 
-            public class Windows : Platform
+            class Windows : Platform
             {
                 protected override BuildPlatform BuildPlatform => BuildPlatform.Windows64;
             }
 
-            public class UWP : Platform
+            class UWP : Platform
             {
                 protected override BuildPlatform BuildPlatform => BuildPlatform.UWPx64;
             }
 
-            public class XboxOne : Platform
+            class XboxOne : Platform
             {
                 protected override BuildPlatform BuildPlatform => BuildPlatform.XboxOne;
             }
 
-            public class Linux : Platform
+            class Linux : Platform
             {
                 protected override BuildPlatform BuildPlatform => BuildPlatform.LinuxX64;
             }
 
-            public class PS4 : Platform
+            class PS4 : Platform
             {
                 protected override BuildPlatform BuildPlatform => BuildPlatform.PS4;
             }
 
-            public class XboxScarlett : Platform
+            class XboxScarlett : Platform
             {
                 protected override BuildPlatform BuildPlatform => BuildPlatform.XboxScarlett;
             }
 
-            public class Android : Platform
+            class Android : Platform
             {
                 protected override BuildPlatform BuildPlatform => BuildPlatform.AndroidARM64;
             }
 
-            public class Switch : Platform
+            class Switch : Platform
             {
                 protected override BuildPlatform BuildPlatform => BuildPlatform.Switch;
             }
 
-            public class Editor : CustomEditor
+            class Editor : CustomEditor
             {
                 private PlatformType _platform;
                 private Button _buildButton;