Yes, you can create a new folder, but you cannot drag anything into it. You can place new waypoints on the map with that folder selected and they will be in there. Please email the beta team with your results: mac.bobcat@garmin.com
I am running the latest download, the File->New Folder menu is grayed out and cmd shift N just makes the "you can't do that" boop noise. No new folders for me. Are you running the latest download? If so why are you able to create new folders and I can't (even if you can't move anything)?
RB