When I'm done with the Apply Styles window, I want to close it with the keyboard. An old trick back from Windows 3 is to press Alt+Space, which sends focus to the small system menu containing Move, Size, and Close options; I can then press Alt+C to close.

On Word from Office Professional Plus 2013, pressing Alt+space does nothing while in the Apply Styles window, regardless which control I Tab focus to. Why isn't it recognizing the standard Alt+space keyboard combo?