Win10 20H2 removed yet another setting. I guess this is Microsoft’s attempt of protecting users from themselves. Yes, auto-login is a security risk. But that’s our business, not Microsoft’s.
Here is the quick way to get it back.
Open an elevated (run as admin) command prompt or Power Shell console an copy/paste:
reg ADD "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\PasswordLess\Device" /v DevicePasswordLessBuildVersion /t REG_DWORD /d 0 /f
Now press the Windows + R keys > type netplwiz and the auto-login setting is back.