When one person is editing an article using the SP Page Builder front end editor, another person can open/edit/save the same article simultaneously in Joomla Content>Articles, as it does not show as locked for editing there.
I discovered this when trying to edit using SPPB front end editor, and the article was shown as locked there. I knew no-one else was editing (the site isn't live yet) so went to Content>Articles to try and check the article back in, but that wasn't possible because it didn't show as locked. Instead I successfully edited and saved the article there.
I did eventually manage to book the article back in, but only through System Global Check-In, which is crude, as you cannot select a single article. You have to check in all SPPB articles.
This is not acceptable when the site goes live. Is there a way to prevent it?