That's a really great question, and you're right, not everyone will need the Scopes or arrangement features, especially if they already have a window manager like aerospace that they love.
Right now, there isn't a single toggle to disable them, but they are designed to be completely opt-in. The arrangement features only activate if you explicitly multi-select windows and choose a layout, so they shouldn't interfere with your setup if you're just using Macscope for searching and switching.
That said, I completely agree that a dedicated 'switcher-only' mode is a fantastic idea. I'll add an option to disable the advanced management features in an upcoming version. Thanks for the great suggestion!
In the meantime, the free trial should be safe to use alongside aerospace if you stick to the search/switch functionality.