FIXED!

Editor/Scripts/Editor/AssetGraphData.cs

@@ -16,9 +16,9 @@ namespace AssetGraph.Core
     [CreateAssetMenu(menuName = "Image Processing Graph/New Graph")]
     public class AssetGraphData : ScriptableObject
     {
-        [SerializeField] private List<AssetGraphNode> nodes;
+        [SerializeReference] private List<AssetGraphNode> nodes;
         [SerializeField] private List<GraphConnection> connections;
-        [SerializeField] public List<AssetGraphNode> runOrder;
+        [SerializeReference] public List<AssetGraphNode> runOrder;
         [SerializeField] public List<AssetGraphStickyNoteData> stickyNotes;
         
         public List<AssetGraphNode> Nodes => nodes;

Editor/Scripts/Editor/Windows/AssetGraphEditorWindow.cs

@@ -61,6 +61,7 @@ namespace AssetGraph.Core
             serializedObject = new SerializedObject(currentGraph);
             currentView = new AssetGraphViewWindow(serializedObject, this);
             currentView.graphViewChanged += OnChange;
+            rootVisualElement.style.flexGrow = 1;
             rootVisualElement.Add(currentView);
         }
 

Editor/Scripts/Editor/Windows/AssetGraphViewWindow.cs

@@ -48,13 +48,15 @@ namespace AssetGraph.Core
             
             searchProvider = ScriptableObject.CreateInstance<AssetGraphSearchProvider>();
             searchProvider.graph = this;
-
+            
             edgeConnectorListener = new AssetGraphEdgeConnector(this);
             
             this.nodeCreationRequest = ShowSearchWindow;
-
+            
             this.window = window;
             
+            
+            
             StyleSheet styleSheet = AssetDatabase.LoadAssetAtPath<StyleSheet>("Assets/Unity Image Processing/GraphView.uss");
             if (styleSheet == null)
             {
@@ -64,12 +66,12 @@ namespace AssetGraph.Core
             
             GridBackground background = new GridBackground();
             background.name = "Grid";
-            Add(background);
+            this.Add(background);
             background.SendToBack();
-
+            
             CreateButtons();
-
-
+            
+            
             this.AddManipulator(new ContentDragger());
             this.AddManipulator(new SelectionDragger());
             this.AddManipulator(new RectangleSelector());

GraphView.uss

@@ -1,4 +1,4 @@
-ImageProcessingGraphViewWindow 
+AssetGraphViewWindow 
 {
     flex-grow: 1;
 }