Display unexpectedly NOT widescreen

I have a feeling this is a silly question and an easy fix but here goes: After restarting my macbook pro my display is no longer in widescreen but instead has black 1" margins on the right and left. Not a dire issue, of course, but vexing since my applications still opening in widescreen.

I've gone through my display change options and haven't seen anything promising. Anyone care to put me out of my misery and let me know how to correct the display?
Thanks.

 

Thanks.

Yes, yes, should have figured that one out.