How Do I stop Dropbox from syncing the external drives

Thanks, Hanna. I read another comment on another thread where the person said "you can delete the external" and I went into my Dropbox and lo and behold. There it was. I disconnected it first, to be on the safe side, then deleted from Dropbox. Of course I got the message "Dropbox can't continue to backup (sync) without the External." Good. 🙂 And that worked. It also made the issue that was causing the sync to stop on and off for five days to finalize. I then checked the box to just save local (and got the cryptic message "if you move this file you won't be able to access on any device" which I finally figured out that doesn't mean my computer, it means phones, pads, etc. So after five days all is finally back to where I can actually move a file into a folder on my computer without being asked if I'm sure I want to put a file in a folder on my computer. So, I'm done for now. The folders I want in Dropbox are there. The folders that I don't want there, aren't.