Preview environment and model options menus are overlapping and not working correctly

TeamViewer_S6JQwNlz1d.mp4

When pressing preview environment and model buttons in Material Editor, on macOS the options menus stay on the screen until the user makes a selection. This causes the options menus to overlap and the options won't go away, if user clicks anywhere else in the screen.

Also depending where the user clicks in the button, the options menu seem to open where the user clicked, which might be little bit inconvinient.