can't see full image on mac

[kt80rep]

I'm having a problem similar to one posted last year for which no resolution is posted.  I need to edit one of my entries, but the right side of the image is cut off on my screen, so I can't access the edit button.  It's not a resolution problem - I expanded my screen but it still only shows part of the text and the right side of the image is blank.  How do I fix this?  I don't want to have to use "forms" view.