there are postings referring to older threads with an explanation why FreeFileSync doesn't rename/move folders but re-create them and move only the files, e.g.:
andZenju wrote:01 Aug 2017, 16:42No, folders are not moved, but the files contained. I believe there is some old thread here on the forum explaining this in more detail.
I can't find these old threads but I'm curious about the reason.Zenju wrote:26 Jun 2018, 07:42The link is actually good as it lists the prerequisites for move detection, one of which is probably not fulfilled in your case. Note that technically all the files will be moved rather than the folder. But this has been discussed a couple of times already on the forum.