It's called Lens Correction. Right-click on any of the other panel headings and make sure there is a checkmark for Lens Correction.
Thanks so much. This is one of those little computing things that leave me feeling pretty dumb. Even with the 'right-click' clue, I still couldn't get there because I couldn't coe up with a right-click equivalent on my Macbook Air. I dug and old USB mouse out of storage and things fell into place. The non-visible menu appeared . . . and so on.
I've been doing this stuff on Macs and Windows machines since my first Apple II in about 1980. When will I be competent?
Go to the Window menu, select Panels, select Lens Correction