[Gimp-user] how to re-set minus key

[flexible_fotography <forums gimpusers com>]

the keyboard shortcut of '-' (minus key) as a zoom out has suddenly changed. 
now the minus key has become a shortcut for exporting an image (CNTL+SHIFT+E
keyboard shortcut).  i cannot find a way to change the function back to the zoom
out.  even in the drop-down menu, the '-' sign doesn't appear! (see attachment).
can anyone tll me how to re-set the minus key function so that it again works as
zoom out?
thank you in advance.
mlc

Attachments:
* https://www.gimpusers.com/system/attachments/1328/original/gimp_minus.doc

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