Hide,Unhide Logon Names

If you want to hide or unhide the names of users that are displayed on the initial logon screen:
Start Regedit
Go to HKEY_LOCAL_MACHINE \ SOFTWARE \ Microsoft \ Windows NT \ CurrentVersion \ Winlogon \ SpecialAccounts \ UserList
Add a DWORD with the name of the user account you want to hide
Make sure it has a value of 0
If there is an existing account, you can unhide it by giving it a value of 1