Upfront/Spirit Mobile/Tablet Appearance options not accessible?

Hello,

I am trying to edit the global theme Appearance settings in Upfront for my main nav menu. The default (1080px) settings seem to be working fine. However, the tablet (570px) and mobile (315px) colors are set as the same as the default (1080px), presumably updating when I edit the Default Preset. This is what I want—same colors across all screen types.

However, when I test the mobile and tablet screen sizes, the menu appearance is the same as it was when I installed Spirit. That is, when I update the settings, they only update for the default screen size.

How can I make it so all screen types are edited and updated when I edit the Default CSS Preset for Default Navigation?

Thanks,

CS