Scholar theme menu setup

I'm using the BP Scholar theme w/o BP.

In >Appearance>Menus> I set up a Main Menu for Primary Navigation, but it does not seem to work.

Under pages I defined Parent and Order, but this is awkward to maintain and does not allow for me to not display pages.
Which I now need to do to hide a "mobile" page from the "desktop" users.

Regards,
Larry

Larry