How to get rid of something about space navigation, music? ...

Dressing space,

Advanced settings,

Custom navigation,

Select your favorite navigation,

Edit navigation,

Select the columns you don't want to display,

Home page, journal, photo album and personal file can't be cancelled, and everything else seems ok.

These also need yellow diamonds. It seems that three yellow diamonds will do.

But I think people say that if you just change the navigation, no matter how many levels.