Unable to change lock/login screen on Mac Studio after reset and safe mode

I noticed that I can't change the lock/login screen on my Mac Studio. Unfortunately making the changes in Safemode still does not allow the system change to take effect even after a reset.

I followed some steps I have found in the community

like step1. Make sure guest user turned off

step2.Have only 1 user

step3.Must turn off File Vault

Still the change won’t stick

Even after these settings have been modified and in safemode

I also have reinstalled the OS.

I did not have the option to set up the lock screen or new user name

I have changes my password. Tried being logged out of apple account.

nothing effects the settings.

I have tried to erase that particular screen image but it the system won’t let me delete it and I am the administrator

[Re-Titled by Moderator]