Menu Display Problems

Hi, I’m having an issue with a mobile menu.

I have one menu set up, it has every role assigned to it, including mobile device navigation. On the full size site we want it only to display at the top, so I turned the Main Menu display to “none”. The menu is correct on the full site- it displays in the top nav only- but then the mobile menu goes away altogether.

How do I get it so the menu shows on mobile but not in the main menu area on the full size site?

Screenshots attached