Meierme Hi there!
I'm going to reiterate what I understand here just in case I'm wrong.
It sounds like what you'd like is to be able to move around the "screens" that contain your apps and widgets around. So for example, whatever was your "home screen" (the one in the middle) can be moved around, and another one can be made the "home screen" instead etc.
If that is what you mean, then this doesn't look like something that's possible with the default GrapheneOS launcher (AOSP Launcher).
However, you may be able to find a 3rd party launcher with that functionality and use that instead if not having that feature is a deal breaker.