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Force selected system UI language to overwrite the user UI language
GPO PowerShell Regedit CMD
In Registry Editor we can see the following changes:  For Enabled we get:  FullKeyPath : HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\MUI\Settings ValueName   : MachineUILock Value       : 1 For Disabled we get:  FullKeyPath : HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\MUI\Settings ValueName   : MachineUILock Value       : 0