I've found the latest software to be buggy and wanted to rollback to the official software however I followed the steps to deregister and I connected my phone to smart switch on my laptop but no prompts came suggesting to update and renroll
After withdrawing from the beta and connecting to pc using smart switch You should get info on main screen where it shows your phone and info about it to download the latest software.
You won't be able to re-enroll to this beta.
Can you please describe the bugs you encountered in latest beta ...U7ZSLC.
Once you are withdrawn from Beta and your device is connected to your PC version of Smart Switch, you should have the option to downgrade to Android 9 (remember to do a factory reset after it).
If you can't rollback to Android 9, please send a report via Samsung Members. If the issue continues, please visit the nearest Samsung Service Centre where they should be able to reinstall the software.
As @Leon24xxx mentioned, you won't be able to go back to the Beta Programme.