Disabling fast user switching

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

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.

1. Open Terminal.

2. Type the following command: sudo defaults write /Library/Preferences/.GlobalPreferences MultipleSessionEnabled -bool false, then press the Enter key.

3. Enter your system password.