Old topic, I know 
But I have recently tried Ubuntu Mate 20.04, and rearrangement of the favorites via drag and drop still isn't working. I tried with Mint Mate 19.3, and it's working fine.
I can do that list rearrangement of course, but that is not for beginners. There are some people who I want to recommend this system to, but they are beginners and the drag and drop rearrangement would be a lot better for them.
Any idea or info about this?
Thanks a lot