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Is there a reliable way to disable fast user switching (programmatically or via profiles) in macOS 10.13 and 10.14?

Thanks, -- M

Here is the command:
defaults write /Library/Preferences/.GlobalPreferences MultipleSessionEnabled -bool 'NO'

You can also create a profile to disable it, and with a profile they will not be able to bypass the setting. It is under LoginWindow -> Options

Thank you very much, @mlizbeth and @tomhastings!

I found this however doesn't stop concurrent user login (fast user switching) through remote access (screen sharing, ARD or VNC). It only removes the switch user on the lock screen.

scratch that

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