how to change login wallpaper on macbook pro osventura

Hello LW6974,

Thanks for posting in the Apple Support Communities. Looking over the article below, you'll note that there are instructions for changing the desktop picture and your screen saver, but none for the login imagery. Given this, there is no option to change it. This image is determined by the version on macOS you have installed.

Customize the desktop picture on your Mac - Apple Support

Use a screen saver on your Mac - Apple Support

If you'd like to provide suggestions to Apple about the option to customize this as well, you can submit your comments at Product Feedback.

Best regards.

you can only make the login screen 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