George, THAT was the key!!!
“At the moment you use the mouse pointer to draw the rectangle”. !!!
My “problem” is that I don’t draw a rectangle. I click on the crop tool at the top of the page, which brings up the means of adjusting the top/bottom/right/left edges, and as I start adjusting them, my rectangle is constrained.
BUT…
If I do the same thing, and instead of adjusting one of the edges, I hold down the SHIFT key, and draw a new rectangle, the setting changes to UNCONSTRAINED and I can create any cropping rectangle I want.
I’m all set. I’'m just used to doing it like I do in Lightroom, which apparently already has been configured the way I want it to work.
THANK YOU!