ok, I think I answered my own question. I did the following steps:
1. Go to "File..|Sync Settings", set it to not sync. Press 'ok'
2. Quit moneydance
3. Delete the old synced folder (this is for safety)
4. Relaunch Moneydance
5. Go to "File..|Sync Settings", and point it to the desired new folder location. Press 'ok'
Of course, I will need to repeat a variant of the above on the other computers that I wish to sync.