Here's how to Disable Password sign-in for local accounts on Windows 11.
Note: Make sure you add PIN or any other alternative sign-in option, before you disable password sign-in for local accounts.
Registry location: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Authentication\Credential Providers\{60b78e88-ead8-445c-9cfd-0b87f74ea6cd}.