Sorry if this is a duplicate question, but my searching found nothing. But I solved this on my other systems a long time ago and I've forgotten how.
I have a 20.04.1 Xubuntu system with about 100 desktop icons for unoccupied mount points (never mind why I have so many). I can only find a way to remove "file system" and "home". I'd really like to remove them all, or at least the empty ones.