謝謝，在regedit中找到了那字符串

https://bridec.com/configure-a-windows-10-interactive-logon-message/

\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\PolicyManager\Providers\48DB0AD5-F572-49A9-8A77-68A1D46E3E92\default\Device\LocalPoliciesSecurityOptions 

\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Provisioning\NodeCache\CSP\Device\MS DM Server\Nodes\105 

\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System  字符串改空

\HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Policies\System