There should be a way to sort vault categories. I was in my vault a couple minutes ago and wanted to add a Extra Ornaments category to store my spare ones. Sadly, this was put at the end of the list and I like to keep them alphabetized. There is currently no way to organize it and the Galleries have that feature. I think it should be brought to the vault now too.

(Sorry if this is a repeat, I didn't see it.)

Yesss, I'm so keen for more vault category functionality. Renaming categories and reordering them would be great.

I'd love to be able to search by name or rarity or whatever within a single category too, and also if I remove something from a category in any way take me back to that category (and on the page I was originally on) not the main vault page. I think those ideas would take more work to implement than just reordering the categories though.

Yeah, probably. The entire Vault system could do with a revamp to make it easily more usable now that Galleries are no longer as big as they was.