Hide the name of the last user to log on
On a computer joined to a domain, by default the name and picture of the last user who logged on appears on the logon screen . On a system that's used primarily by a single user, this is a convenient feature that allows the user to log on again without typing his or her name each time. For a computer that's shared by many users, you might prefer not to show the last user. You can prevent the last-used name from appearing by typing secpol.msc at an elevated command prompt to open Local Security Policy. In Local Security Policy, open Local Policies\Security Options . Then enable the policy setting named Interactive Logon: Do Not Display Last User Name .
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