I’m writing this from memory, but I had noticed when I was trying to clear all of the available dungeons (23 dungeons?) during early access; from the screen where you could check your codex and challenges, under challenges, where the 23 dungeon challenge was listed with the checkboxes and completed dungeons…when I expanded the list, I was unable to scroll all the way to the bottom, to view the list.
My guess, is that it’s supposed to scroll with the right thumbstick…but it didn’t. You could scroll the list of challenges on the right with the right thumbstick, but once expanded, I was no longer able to scroll.