Zotero beta can't full screen

I am currently using 7.0.0-beta.75+f7dc68c7f on MacBook, I found out that I couldn't enter full screen after I closed the window of Zotero and reopened it.
https://s3.amazonaws.com/zotero.org/images/forums/u13462378/rk5c3l25p4kvaaaegt8h.png
The only thing that I can do is quit the Zotero and open it again, please help with this problem.
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