First of all who have not installed Beta Android 10 yet and are going to install, Please take backup of all your stuff on PC/Hard Disk. This is the most important step before installing any Beta software as it is not stable.
People who have already installed Beta Android 10 should not try to move out of Beta and Re- Install Android Pie just because they are facing some issues because Reinstalling Android Pie will erase your data and some of the Features like Lock Screen and Biometrics wont work. Also people who are using Beta Software dont try to update your fingerprints or change the lock type as there are many issues reported regarding the same.. Also dont use Lock Down mode in Beta Android 10 as that is also creating problems.
People wanting to Re Install Android Pie because of the issues in Beta should not have registered for Beta programme in the first place as Beta software is always unstable. Beta programme is for samsung to find out flaws by giving people access to unstable software and gradually making it stable.. Please be patient if there are any issues with your phone samsung will probably push 2nd Beta software this week which will adress major issues like Lock Screen and Biometrics..
Note 10 Android Beta will probably start directly from 2nd Beta.. which might be the reason for delay in the first place..