I hate that UI2 has removed my ability to set my own permissions, photo tags, and removed my ability to disable Samsung apps I don't want or use, so that they take up space on my phone. How can I revert to UI1 like Android 9 uses?
The only way to revert to an older version is to flash the rom and that's not recommended as you can 'brick' the phone and make it useless. It would also negate the warranty. I would recommend installing a third party launcher instead.