Mac lock screen wallpaper
does anyone know why can't I change the lock screen wallpaper on my Mac? Everytime I change it, it can only be seen on the home screen but not lockscreen
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the Lock Screen wallpaper will match the desktop wallpaper of the account you are logged in to when you lock your screen. the login screen is a different matter. but you use the Lock Screen system settings to change the login window.
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.