I received this advice from Evernote Tech Support: "At this moment, this issue is actually one that the development team knows about and I believe it should be fixed in our latest release (10.18). Can you please log into the Evernote for Mac app and check for updates (Help > Check for updates)? Install that update and see how things are working."
I updated to the latest release 10.17.8 available for my Intel iMac, which seems to have fixed the problem.
FWIW, I'm running the latest Evernote 10.17.6 release on my M1 MacBook and Dell Inspiron (Win 10) with no issues.