That makes sense, but until a month or so ago, it wasn’t causing this problem.
I rarely use scrivenings mode.
So we’re back to my original question. What changed a month ago?
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As I said, the only think I can think of is the Grammarly issue, but I’ve since removed Grammarly.
idea that comes to mind. put Grammarly back temporarily and see what happens.
Took me long enough to get rid of it! 
well i suspect it is not all gone and remnants without the whole system are the root cause. just a hunch. maybe check with Grammerly on exactly all the bits that have to be removed and do a detailed check these bits are in fact gone. do not rely on a third party uninstaller.
beyond that, as we now have gone full circle, my ideas are empty. good luck.
Gotta laugh. I think I may have accidentally stumbled on the solution.
I was sorting out my Preferences when I spotted the Page View bit under Appearance. There was a box checked called “Draw shadow around pages”. I uchecked it and, although it’s still not perfect, it’s a vast improvement.
I thank everyone in this thread for their suggestions and especially your patience.
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Thanks! I can reproduce that condition on macOS 11 as well. I wouldn’t say the problem is bad enough under common conditions (whole book ~100k word Scrivenings sessions is a bit extreme) to spend a lot of time trying to fix it, but what might be a good idea is to put a parenthetical after this option that indicates “(slower performance)” or something to that effect, and maybe disable it by default if it isn’t already (shadows a bit old school anyway in my opinion).
Thanks Amber
As I say, I don’t use scrivenings much and certainly not for the whole manuscript. As for shadows, I have not idea why that box was checked.
Scrivenings doesn’t have a shadow option. The problem is Page View, a sad attempt at WYSIWYG in an app designed around avoiding WYSIWYG.
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Yes, I know. I said the problem was with page view.