change login background

you can only make it match your user account's wallpaper. you cannot set it as a separate image.

if you are the sole user (not even a guest account) AND file vault is turned off you can go to System Settings, in the Lock Screen tab, and set "Login window shows" to "List of users". then your login screen matches your desktop background.

if you are using file vault or have multiple users, the above will not work.  if that's your situation, you will need to wait for apple to address this. it may be worth your time to send feedback directly to apple. Feedback - macOS - Apple. 

xXxJDxXx wrote:

Hi

how how can change my login background?

Any suggestion is accepted ;)

Verify no guest user .

verify no Filevault turned on

and try again. Report back your success or failure.

Customize the desktop picture on your Mac - Apple Support