Well, I think I have figured it out.
The behavior is easy to reproduce if there is only one user account on
the system. Then the Login Screen button is not shown, but OTOH changes
of language/format/input sources are written to /etc/default/locale
respective /etc/default/keyboard without asking for it explicitly.
If you add another user, the button shows up.
So this seems to be about the GNOME thinking in this respect which I'm
not used to, and right now I don't like it either. Look at the Ask
Ubuntu answer I linked to. I tried to help the OP based on what I saw on
my own machine (with more than one user account), but the OP didn't
understand what I was talking about.
The GNOME folks seem to be too smart for their own good. Things like
this cause confusion!! :(
Closing. (Some day, when I'm in a better mood, I may file an upstream
bug.)
** Changed in: gnome-control-center (Ubuntu)
Status: Incomplete => Invalid
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https://bugs.launchpad.net/bugs/1730900
Title:
"Login Screen" button not present in Region & Language
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