You're right. For some reason I couldn't see the folders being created, but after restarting Firefox (about:profiles required me to do after creating profiles with the new UI), they are created.

Do you know if there's any way to have old profiles showing on this new UI?

Edit: They seem to be working on this:

- https://bugzilla.mozilla.org/show_bug.cgi?id=1996240

- https://phabricator.services.mozilla.com/D270525