GUI with pointcloud and image windows

Can someone please explain how to have multiple windows (scenes) within the GUI with one being 2D images only?

Perhaps the open3d.visualization.gui. ImageLabel is the the way that image windows are added to the GUI?

I am wondering if I should abandon trying to use Open3D at all. The focus seems to be on development with very little help to the community from the developers. A quick scan of the forum shows most questions unanswered.