How to Extend the Wave Function Beyond the Horizon of the Observable Universe

The traditional cosmological multiverse has a single semi-classical space time spread throughout a distance much, much larger than what we can observe. The everready multiverse says when I observe a spin right here in the room, there's now an infinite number of regions with different kinds of observers seeing different things. So it would be fair to argue that still for all intents and purposes, you have something that is very, very much like a multiverse. Maybe you're not locating different universes and different legitimate physical locations because you're not in a classical space time when you go outside what we could observe. But there are still different observers, maybe some of them see different laws of