What is a demoted menu?

yes

these are drop down menus:homeinsertpage layoutformulasdatareviewview

The user interface of the Start Menu lists frequently used programs which changes the more you use your computer, and a list of commonly used programs that affords you a path to open most any program...

A menu has foods that they sell, and there prices. Sometimes it has a map of the place on it, or a description of the place.

In the military service a promotion is getting a higher rank, hence a demotion (less common) is being dropped down to a lower rank. By extension, it might be said that when Pluto was stated to be not...