You can use the local group policy editor app to configure the option.
Windows 10 login screen background gpo.
In windows 10 version 1607 the lock screen background does not display if you disable the animate windows when minimizing and maximizing setting in this pc properties advanced system settings performance settings visual effects or if you enable the group policy setting computer configuration administrative templates windows components desktop windows manager do not.
Windows 8 and windows 10 make customizing your lock screen easy all you have to do is head to settings personalization lock screen.
Select windows spotlight for an automatically changing selection of images from microsoft or select picture or slideshow to choose your own preferred background image.
You can configure the sign in screen background you want on the lock screen settings page too.
After a few weeks of banging around with microsoft partner support they have just confirmed that this will be fixed shortly.
Finally windows 10 build 18312 comes with a new group policy option that you can use to disable the acrylic blur effect feature on the sign in screen background image.
The image you select here will appear as both your lock screen background and sign in screen background.
The screens look slightly different in windows 8 than they do in windows 10 but they re the same settings.
If you have windows 10 enterprise or education you should be able to use a gpo to set a custom lock and home screen.
Active directory gpo.
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How to enable or disable changing lock screen background in windows 10 by default in windows 10 users are able to change their lock screen background image to windows spotlight picture or a slideshow as often as they like.
Windows 10 comes with lock screen image that can be customized in control panel.
How to change the login screen background on windows 10.
I used to do this using the desktop wallpaper gpo mainly to mess with people but it never worked unless the file was on the local file system.
Unfortunately windows 10 1703 broke that and it has been driving many it staff crazy trying to fix it.
Disable blur on sign in screen in windows 10.