Disable Hero wallpaper on Windows 10 login screen. Microsoft has released Windows 10 build 10547 to insiders in the fast ring, visit Windows blog to read more about it. 10547 build now lets you turn off (default) Hero background image on the login Screen, here is how you can do that, if you don’t like it.
Disable Windows 10 default login screen (hero) background image in 10547 build
1. Click on Settings > Personalization > Lock Screen, turn off ‘Show Windows background Picture on the sign-in screen’.
Note: Windows doesn’t offer a setting to change sign-in screen background image to custom one, for that, you may want to use Login Screen background changer app instead.