How to remove menu when in mobile view?

Hey there, I am having issues trying to get a decent looking menu in mobile (the default one creates a list of the 40+ pages in the menu + submenus)
Because I was at the end of my tether I resorted to using a plugin for the menu on mobile devices, however, I have no idea how to remove the menu when in a frame that is small enough to become what is the mobile site (if that makes sense)

I would love to give you information on what the theme is called, but I have no idea, as the theme shows up as theme44910. All I know is it uses the Cherry Framework to run.

Thanks for your help