diff --git a/MatterControlLib/ApplicationView/PrinterModels.cs b/MatterControlLib/ApplicationView/PrinterModels.cs
index 145e284d2..b97a0b9a0 100644
--- a/MatterControlLib/ApplicationView/PrinterModels.cs
+++ b/MatterControlLib/ApplicationView/PrinterModels.cs
@@ -675,21 +675,20 @@ namespace MatterHackers.MatterControl
 			}
 		}
 
-		public double SceneTreeHeight
+		public double SceneTreeRatio
 		{
 			get
 			{
-				if (double.TryParse(UserSettings.Instance.get(UserSettingsKey.SceneTreeHeight), out double controlHeight))
+				if (double.TryParse(UserSettings.Instance.get(UserSettingsKey.SceneTreeRatio), out double treeRatio))
 				{
-					return Math.Max(controlHeight, 35);
+					return treeRatio;
 				}
 
-				return 35;
+				return .75;
 			}
 			set
 			{
-				var minimumValue = Math.Max(value, 35);
-				UserSettings.Instance.set(UserSettingsKey.SceneTreeHeight, minimumValue.ToString());
+				UserSettings.Instance.set(UserSettingsKey.SceneTreeRatio, value.ToString());
 			}
 		}
 
diff --git a/MatterControlLib/PartPreviewWindow/SelectedObjectPanel.cs b/MatterControlLib/PartPreviewWindow/SelectedObjectPanel.cs
index 745aec17e..3d3bdcb55 100644
--- a/MatterControlLib/PartPreviewWindow/SelectedObjectPanel.cs
+++ b/MatterControlLib/PartPreviewWindow/SelectedObjectPanel.cs
@@ -160,9 +160,9 @@ namespace MatterHackers.MatterControl.PartPreviewWindow
 			scrollableWidget.AddChild(editorPanel);
 			scrollableWidget.ScrollArea.HAnchor = HAnchor.Stretch;
 
-			editorSectionWidget = new SectionWidget("Editor", scrollableWidget, theme, toolbar, serializationKey: UserSettingsKey.EditorPanelExpanded, defaultExpansion: true, setContentVAnchor: false)
+			editorSectionWidget = new SectionWidget("Editor", scrollableWidget, theme, toolbar, serializationKey: UserSettingsKey.EditorPanelExpanded, expandingContent: false, defaultExpansion: true, setContentVAnchor: false)
 			{
-				VAnchor = VAnchor.Stretch,
+				VAnchor = VAnchor.Stretch
 			};
 			this.AddChild(editorSectionWidget);
 
diff --git a/MatterControlLib/PartPreviewWindow/View3D/View3DWidget.cs b/MatterControlLib/PartPreviewWindow/View3D/View3DWidget.cs
index 94c8b6c6b..1f0b50303 100644
--- a/MatterControlLib/PartPreviewWindow/View3D/View3DWidget.cs
+++ b/MatterControlLib/PartPreviewWindow/View3D/View3DWidget.cs
@@ -159,7 +159,7 @@ namespace MatterHackers.MatterControl.PartPreviewWindow
 
 			modelViewSidePanel = new LeftResizeContainer(theme)
 			{
-				Width = printer?.ViewState.SelectedObjectPanelWidth ?? 200,
+				Width = printer?.ViewState.SelectedObjectPanelWidth ?? 250,
 				VAnchor = VAnchor.Stretch,
 				HAnchor = HAnchor.Absolute,
 				BackgroundColor = theme.InteractionLayerOverlayColor,
@@ -223,10 +223,12 @@ namespace MatterHackers.MatterControl.PartPreviewWindow
 			Splitter historyAndProperties = new Splitter()
 			{
 				Orientation = Orientation.Horizontal,
-				SplitterDistance = sceneContext.ViewState.SceneTreeHeight,
+				Panel1Ratio = sceneContext.ViewState.SceneTreeRatio,
 				SplitterSize = theme.SplitterWidth,
 				SplitterBackground = theme.SplitterBackground
 			};
+			historyAndProperties.Panel1.MinimumSize = new Vector2(0, 120);
+			historyAndProperties.Panel2.MinimumSize = new Vector2(0, 120);
 
 			modelViewSidePanel.AddChild(historyAndProperties);
 
@@ -234,7 +236,7 @@ namespace MatterHackers.MatterControl.PartPreviewWindow
 
 			historyAndProperties.DistanceChanged += (s, e) =>
 			{
-				sceneContext.ViewState.SceneTreeHeight = historyAndProperties.SplitterDistance;
+				sceneContext.ViewState.SceneTreeRatio = historyAndProperties.Panel1Ratio;
 			};
 
 			historyAndProperties.Panel2.AddChild(selectedObjectPanel);
@@ -280,7 +282,10 @@ namespace MatterHackers.MatterControl.PartPreviewWindow
 
 			viewOptionsBar.AddChild(modelViewStyleButton);
 
-			printer.ViewState.ViewModeChanged += this.ViewState_ViewModeChanged;
+			if (printer?.ViewState != null)
+			{
+				printer.ViewState.ViewModeChanged += this.ViewState_ViewModeChanged;
+			}
 
 			ApplicationController.Instance.GetViewOptionButtons(viewOptionsBar, sceneContext, printer, theme);
 
@@ -437,7 +442,10 @@ namespace MatterHackers.MatterControl.PartPreviewWindow
 			Scene.SelectionChanged -= Scene_SelectionChanged;
 			this.InteractionLayer.DrawGlOpaqueContent -= Draw_GlOpaqueContent;
 			this.sceneContext.SceneLoaded -= SceneContext_SceneLoaded;
-			printer.ViewState.ViewModeChanged -= this.ViewState_ViewModeChanged;
+			if (printer?.ViewState != null)
+			{
+				printer.ViewState.ViewModeChanged -= this.ViewState_ViewModeChanged;
+			}
 
 			modelViewSidePanel.Resized -= ModelViewSidePanel_Resized;
 
diff --git a/MatterControlLib/SettingsManagement/UserSettings.cs b/MatterControlLib/SettingsManagement/UserSettings.cs
index 9ceab1a1c..6f8e12c4c 100644
--- a/MatterControlLib/SettingsManagement/UserSettings.cs
+++ b/MatterControlLib/SettingsManagement/UserSettings.cs
@@ -61,7 +61,7 @@ namespace MatterHackers.MatterControl
 		public const string UpdateFeedType = nameof(UpdateFeedType);
 		public const string LastReadWhatsNew = nameof(LastReadWhatsNew);
 		public const string ActiveThemeName = nameof(ActiveThemeName);
-		public const string SceneTreeHeight = nameof(SceneTreeHeight);
+		public const string SceneTreeRatio = nameof(SceneTreeRatio);
 		public const string SelectedObjectEditorHeight = nameof(SelectedObjectEditorHeight);
 		public const string SelectionTreeViewPanelExpanded = nameof(SelectionTreeViewPanelExpanded);
 	}
diff --git a/Submodules/agg-sharp b/Submodules/agg-sharp
index 17d30ea81..45c8b0347 160000
--- a/Submodules/agg-sharp
+++ b/Submodules/agg-sharp
@@ -1 +1 @@
-Subproject commit 17d30ea8103851a07d2d92ea5765fc947b8dffb5
+Subproject commit 45c8b034752b11b7a7f584148845865dd39f24de