To change the settings, you need to select the blank option in the service menu, press enter, go to Appearance Options and change the theme, and re-enter the service menu. This is done to match the service menu to the arcade game.
in the Custom Options, if you changed it to be RandomMovies (accessible via blank option in the service menu), change it to RandomMovies and install some random movie files in the RandomMovies folder. Examples of such files are available on my repository: https://github.com/h-lunah/DDR-A3-KIT/tree/legacy/RandomMovies