Have installed android 12 and come across a big issue...the company I work for have their own app for staff that list clients and times of calls (care worker) and their app isn't compatible with android 12....so I meed to roll back to 11 until company have reconfigured app to work with 12
That's good to know then. I did not think you could as it updated the file system. If it is possible then just download the latest official 11 Rom from Samsung or SamMobile and flash it using Odin via your laptop or computer. There are detailed instructions all over the Web on how to do this but back up first and do a complete wipe/flash.
As I say this is from memory but to do it " officially " there is a request option to Samsung to remove you from the Beta registration and instructions to restore the previous ( didn't involve Odin or anything non official Samsung )