PhpStorm 2016.3 Open multiple projects in one frame not working
已回答
Checkbox "Add to currently opened project" does not exist

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Hi there,
How do you open the project? "File | Open Recent" or "File | Open"?
ATM you should use 2nd one.
https://youtrack.jetbrains.com/issue/PY-20579
"File | Open Recent"
That option is not available for "Open recent".
Check that ticket for details. Watch it (star/vote/comment) to get notified on any progress.
This just caught me out with PyCharm and was confusing me - glad I found this post as I was about to submit a bug report.
It's not intuitive to me that this option should not be available for "Open Recent" - in my case it's always a recent project that I want to add!