Hello @Osorbiic ,
Once withdrawn you can download smart switch on the PC and restore to Android 11.
Please back up all data on your device before using smart switch to move back to Android 11 as this does reset the phone. if you do choose to move to Android 11 , we suggest you backup all your device data and master reset on Android 12 and try if for a few days. If issues are still not resolved, you always have the choice to withdraw and move back to Android 11.
One UI Beta Team.