won't show all users at log in

Blow, Recently added my girlfriend to my computer but when it boots up it will only show my user icon as an option. you can manually type its user name and password in but i have an automatic icon for it and it will not show. I wentogled it and came across 2 options but neither of them works. Anyone else have this problem and know how I can resolve it?

Thanks!

I did not find the right solution from the Internet.

References https://www.bleepingcomputer.com/forums/t/655377/wont-show-all-users-at-log-in/

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