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1. Choose Apple > System Preferences (macOS 11 or 12) or Apple > System Settings.

2. macOS 11/12

   1. Click Users & Groups.

   2. Click the account whose settings you want to change.

   3. Click Login Options.

   4. Clear the Show fast user switching menu as <Full Name> check box.

   5. Click the lock to prevent additional changes to the settings.

   6. Close the Users & Groups window.

3. macOS 13/14

   1. Open Terminal.

   2. Type the following command: sudo defaults write /Library/Preferences/.

...

1. 1. GlobalPreferences MultipleSessionEnabled -bool false, then press the Enter key.

   2. Enter your system password.