Map of Stars is unusable in Photon UI

How do I get my other map back without dumping all of the Photon UI stuff?

Which map do you mean? The old, classic map or the new pre-alpha map? If you want to get the classic map back, activate it in ESC > General Settings > middle column “Map” > Use classic map. If you want the pre-alpha map for some inexplicable reason, do the same and just uncheck the box.