Prevent enabling lock screen slide show
Disables the lock screen slide show settings in PC Settings and prevents a slide show from playing on the lock screen.
By default, users can enable a slide show that will run after they lock the machine.
If you enable this setting, users will no longer be able to modify slide show settings in PC Settings, and no slide show will ever start.
At least Windows Server 2012 R2, Windows 8.1 or Windows RT 8.1
Not Configured - No registry values are specified.
Disabled - Any values that would be created by the policy in the registry are deleted.
Enabled - Adding, modifying or delete values in the registry.
Prevent enabling lock screen slide show can be found in the Group Policy.
Please navigate to Computer Configuration - Policies - Administrative Templates - Control Panel - Personalization folder.