If you go into the advanced options in the controller settings, there’s an option that let’s you configure the desktop controller mappings. This only affects the actual desktop though, not desktop apps you launch from the plus menu.

Does that actually even work? I remember trying to remap right click to some other button, but changing those settings wouldn’t actually affect the desktop controller mappings at all. No matter what I set any button to, the controller buttons would just keep performing their default actions.