Fixed so that the preview is not drawn ontop of the Settings Menu

com.unity.shadergraph/Editor/Drawing/Views/MaterialNodeView.cs

             }
 
             m_PortInputContainer.SendToBack();
-            if (node.hasPreview)
-                m_PreviewFiller.BringToFront();
-
-
+            
             m_CollapseButton = this.Q("collapse-button");
 
             var settings = node as IHasSettings;