Thank you! That did the rename, but it also moved the files, which I didn't want. (I was able to recover.)
The File Organizer seems to insist on moving files to the "to folder" even when the box is unchecked - or is it that the box gets re-checked by default every time the FO window opens, and I only just noticed that? Other settings seem to be retained, at least sometimes.
When I uncheck the box, the preview in the "new file name" col disappears, as though there has to be specified path. But, if it sees the selected file, it must also see its path, and if I want to keep newly named file it in the same path, then unchecking the "to folder" box should be enough, or so I would think....? There's something I'm not getting here....
Also, where are the presets for the File Organizer saved? And are they only saved after the settings have been run once? [Edit: Yes I see that's it.)