Now load scenes to edit in a quick selection and create predefined scene groups to load them additively.An exception is currently thrown when a scene is added to a group.There is a incompatibility between IMGUI and UIElements there.UIElement is not compatible with IMGUI GUIClips, only GUIClip.ParentClipScopeUnityEditor.EditorWindow:ShowModal ()I found the issue in the Unity Issue Tracker.It should be fixed by Unity in the near future.Are you tired of searching for the scenes you want to edit in the Project Explorer in order to load them? And more importantly, you're tired of clicking together additive scenes by hand? Then use the Scene Tools to load scenes in a quick selection and pack them into groups to optimize your workflow.Optimizes the workflow with scenes in the Unity Editor.Load scenes in a quick selection, no more long searches in the project explorer.Create scene groups to load them additively.Saves setting to asset file, perfect for working with VCS systems.