Screen saver timeout is a REG_SZ parameter with the name ScreenSaveTimeout = 300. Password protect the screen saver is a REG_SZ parameter with the name ScreenSaverIsSecure = 1. They are located in the HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\Control Panel\Desktop: The following registry parameters match the policies discussed above. You can configure computer lock settings using the registry instead of GPO, and deploy the corresponding registry settings to users’ computers via GPO. To implement such a strategy, you may use the GPO Security Filtering (see the example with restricting access to USB devices using GPO) or Item Level Targeting in GPP. For example, the screens of office workers should be locked after 10 minutes, and the screens of production or SCADA operators should never be locked. In some cases, you may need to configure different lock policies for different user groups. The policy is called Interactive logon: Machine inactivity limit and you can find it in Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options. In Windows Server 2012/Windows 8 or newer, there is a separate computer security policy that sets a computer inactivity time after which it is locked. After the GPO has been applied, screen saver and screen lock settings will be protected from editing in the Windows interface, and user sessions will be locked in 5 minutes of inactivity (to diagnose how the GPO is applied, you can use gpresult tool and the article following this link). Wait until the Group Policy settings are updated on the clients or refresh them manually with the command: gpupdate /force. It means that user sessions will be automatically locked after 5 minutes Enable all policies and set a computer idle time in the Screen saver timeout policy. 
Prevent changing screen saver – prevents users from changing screen saver settings.The most often it is scrnsave.scr (you can make a slideshow screen saver using GPO) Force specific screen saver – you may specify a screen saver file to be used.Screen saver timeout – sets time in seconds when a screen saver will be enabled and a computer will be locked if a user is inactive.Password protect the screen saver - prompts to enter a password to unlock a computer.There are some options to manage screen saver and screen lock settings in the GPO section:.Edit the policy edit and go to the User Configuration -> Policies -> Administrative Templates -> Control Panel -> Personalization.Open the Group Policy Management console ( gpmc.msc), create a new GPO object ( LockScreenPolicy) and link it to the domain root (or to the Users OU).Let’s create and configure a domain Group Policy to manage screen lock options:
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