I am trying to use the "Board Outline Define from 3D body" function. I have done this before on older versions of CS, but I do not see the function anymore. I am in 3D view, so the option should be in the pull down list.
This was just asked a few days ago.
https://www.element14.com/community/message/229425/l/board-shape-from-3d-body#229425