Well, in my defense, no one told me to switch it so that the target folder is Pictures. I don't think it's unreasonable to assume that the 2023 folder is the correct folder for a subfolder that pertains to a date in 2023!
The good news is that I did make that change and just imported one sample image to test it, and, yes, it did so correctly. So problem solved going forward. Good. But I'm still having trouble fixing the previous mistake. When I tried to drag that folder one level upward, as you say, I get a "a folder named 2023-11-2 already exists at this location" message.
I guess at this point I could just delete the folder and re-import those images, but I've already done some editing on them and I would hate to undo it.
PS. Is there any kind of video tutorial on this topic out there?
Initially, you must have used the correct folder. So the switch you are talking about happened when things went wrong. At that moment you no longer selected the Pictures folder, but selected the 2023 folder. My point is that I already explained that earlier, but you ignored that and made the same mistake again. Anyway, at least the screenshot made that perfectly clear this time.
Expand all folders in the folder panel, so you can clearly see where a folder is located. If you have two '2023-11-2' folders, then you cannot move the wrong one to the correct location, because the correct one is already there. That is why you get the error. In that case do the following: Select the wrong '2023-11-2' folder and then select all images inside that folder (Ctrl-A). Now do not drag the folder itself, but drag the selected images and drop them into the correct '2023-11-2' folder. The wrong '2023-11-2' folder is now empty, so you can right-click on it and remove it from Lightroom.