Do not display the lock screen
This policy setting controls whether the lock screen appears for users.
If you enable this policy setting, users that are not required to press CTRL + ALT + DEL before signing in will see their selected tile after locking their PC.
If you disable or do not configure this policy setting, users that are not required to press CTRL + ALT + DEL before signing in will see a lock screen after locking
their PC. They must dismiss the lock screen using touch, the keyboard, or by dragging it with the mouse.
At least Windows Server 2012, Windows 8 or Windows RT
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.
Do not display the lock screen can be found in the Group Policy.
Please navigate to Computer Configuration - Policies - Administrative Templates - Control Panel - Personalization folder.