Cannot Resize Back Zotero Window to Original Size After Full Screen in El Capitan

When using Zotero in OSX El Capitan (hidden menu bar option), pressing the full screen button (the green one on the top left side) expanded the Zotero window to full screen, but I have found no way to resize the window back to its original size. The circle buttons on the to left side have disappeared. I can move the full sized window, but not resize it. The Zotero menu bar is missing (even when I disable the hidden menu bar option in El Capitan) and I have not been able to guess any valid shortcut to restore the original window size. Restarting seems not to be of any help.

I don't know if it is a Zotero/OSX bug or just a problem with my computer... or just myself missing something obvious here.

Thanks for your ideas.
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