[Solved] Want Menus to Have Different Color Backgrounds

OK, I figured it out. In order to have the submenus a different color, you have to click on Customize Menu, not Customize Sub-Menu. Further, you must to this for every folder in the menu, which is very cumbersome for large menus.

There needs to be a way to specify, for all submenus in a menu, a background color that is different from the background color of the menu itself. The method you have provided is too cumbersome to apply to all of my submenus individually.