oh wow. How weird. I guess I have not updated yet so I have not noticed.
You can try creating a short cut key for the menu item. Go to Edit>Keyboard shortcuts.... Then in the menu list, find the VIEW, and toggle it open, and then scroll down until you see Zoom In, Zoom out, and then Fit On Screen. try changing the keyboard shortcut, or adding one if it is missing, and see if that works. Hope so!
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