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That's by design. Imagine you had a raunchy wallpaper on a shared computer. Anyone can see it without even logging into your account.

There's a way to change it though but you'd need to do it whenever you change your wallpaper:

Go to /Library/Caches/ and replace or create a new file called "com.apple.desktop.admin.png" and restart.
 
That's by design. Imagine you had a raunchy wallpaper on a shared computer. Anyone can see it without even logging into your account.

There's a way to change it though but you'd need to do it whenever you change your wallpaper:

Go to /Library/Caches/ and replace or create a new file called "com.apple.desktop.admin.png" and restart.
Not true unfortunately, On a clean Mojave installation it changes with the desktop background, but after time macine restore it never change with desktop background
 
Not true unfortunately, On a clean Mojave installation it changes with the desktop background, but after time macine restore it never change with desktop background
Interesting. Does the machine actually have multiple users? The behaviour might be different if there's only one. But regardless, changing the file from Caches should work nevertheless.
 
I don't think you can change the login background. That's because all user files are protected (inaccessible) until you log in. It's a security measure.
 
I don't think you can change the login background. That's because all user files are protected (inaccessible) until you log in. It's a security measure.
Interesting. Does the machine actually have multiple users? The behaviour might be different if there's only one. But regardless, changing the file from Caches should work nevertheless.
On a single user machine the Login Background changes when you change the desktop wallpaper on mojave fresh install and upgrade but not when you restore from time machine.
On a Multi user machine Login Background changes when selecting the user ( and change for the user when they change the desktop wall paper ) and the effect seen before entering the password, that said it does not change when restoring from time machine.
To fix this you need to re install mojave over the restored local machine backup. TESTED :)
 
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