Before you make a decision to uninstall Big Sur, check out some common macOS 11 problems and fixes. Maybe, the problem that is hampering your flow is on the list — and you can easily solve it. Also, if your Mac runs macOS Big Sur beta, you should know the public version available starting November 12 fixes most of the problems.
To go downgrade to an old version of macOS, I would recommend contacting Mac Support.
I downloaded Apple Big Sur program three weeks go, now my printer driver isn't recognized by the new system. I typed Command, Shift, Option R to restart the older version but it said my disc was locked & couldn't go any further. I would appreciate anyone's help to solve this disc is locked problem. Also, someone mentioned I could revert using Time Machine, but not sure if that would help getting out of the Big Sur platform.