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Disabling the guest account on your computer prevents people without an account from logging in to your computer.
Disable Guest Accounts on Windows 10
Guest accounts are automatically disabled in Windows 10.
Disable Guest Accounts on Mac 10.9+
- Navigate to System Preferences.
- Click Users & Groups.
- Click the lock in the lower left, enter your Mac password, and click Unlock.
- Select Guest User on the left.
- Be sure Allow guests to log in to this computer is unchecked.