That seem[ed\s] to be the way. Bravo! However ...
In WindowFX, I unchecked "Make inactive windows semi-transparent," and I also unchecked "Windows should be semi-transparent when being moved and sized." Unfortunately and inexplicably, neither of these "unchecks" seemed to have any effect. I even disabled the entire WindowsFX app, but no difference.
Also, under "Right click menu" I unchecked "Adjust window transparency," but also no effect -- actually, I don't know what that checkbox is for, since it doesn't seem to give me a transparency slider (or anything with similar function) ... maybe that checkbox is useful to WindowsFX cognoscenti during some of their secret activities. And also, there's a blue pushpin next to it which I can't get rid of, which is probably fine since the whole thing doesn't seem to do anything for me anyway. And while I'm venting my frustration: even hokey apps like Sticky Notes become semi-transparent when moved. Now I'll try restarting, and get back to you.
I appreciate your patience with me.