It’s a little buggy in beta (the UI overlaps on each other depending on what you click). I expect that will be fixed in time.
The filtering options are rarity, class, element, and family. There’s also a search by name text box. It’s definitely an improvement from what we’ve had.
But…
Alternate costumes don’t show up when filtering by class.
There are so many families, sometimes I think it would be easier to have some options like “season 2” or “season 3”. as collections of small families.
There’s no filtering by power level, ascension level, or mana speed.
I’m guessing others can quickly name something they’d like as a filter