I had to roll back to the previous full release when testing the beta release (due to an unrelated issue) but I could not find anywhere this information was available when I was running the beta.
I assume the the GUI version is still under development and reconfiguration will come later. You could ask in the release notes topic 2026.3: A clean sweep or it may have been mentioned in the release livestream. I have not had a chance to watch that yet.
Exactly the same as for people running HAOS. In your configuration.yaml file.