"When I say "any change", I mean literally anything, has any event or update occurred, any closing of a program that normally stays open, shutting down or signing out or restarting Windows, Windows Updates, web browser update, anything at all that may possibly coincide with this change in functionality of the Move to folder feature?"
I have no idea. I mean - yeah, I probably had a Windows update, beforehand, but I don't remember when exactly. I had a Firefox update; but again - not sure exactly when. I'm usually slow about updating stuff - I tend to procrastinate like crazy, lol. My best guess is that it (may have) started going wonky after the last Windows update. I'll go see if I can pin down the date / time of that update. Edit: okay, well - the most recent Windows Update that I can find was October 13 (2023). But I think Move to a Different Folder was still working then.
Also: this thread here was started on Oct. 22, and the similar post on Reddit was started 5 days ago today the 26th, meaning this dysfunction seems to have started on Oct. 21st or 22nd, for most people.
One thing that Diane mentioned, somewhere in this thread, is that some of these changes may be geared to making things more "app-friendly" for people who use their phones for this stuff (email, etc.) I don't have a "smart phone"; I have a laptop. I can read WORDS - I don't need tiny little pictures to show me where "Empty Folder" is, etc. I don't know if that has anything to do with this "issue", however.
I'm beginning to feel more and more obsolete each day, lol. :-[