Extra login in on my MacBook Pro [duplicate]

I finally found a solution!

After some more search I found this command:

sudo defaults write /Library/Preferences/com.apple.loginwindow SHOWOTHERUSERS_MANAGED -bool FALSE

..and it did the trick!

I solved this a different way, a better way in my opinion, in my case the root user was active so I turned it off following Apple's instructions.

Just in case the above link stops working, these are the steps:

• System Preferences
• Users & Groups
• Unlock (bottom left)
• Login Options
• Join
• Open Directory Utility
• in Directory Utility Unlock (bottom left)
• In Edit Menu, select Disable Root User

_{Note: I don't know why the root user was active. It might have something to do with the Guest User or with Find My Mac.}