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
In Registry Editor we can see the following changes:
For Enabled we get:
FullKeyPath : HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\Personalization
ValueName : NoLockScreen
Value : 1