How to categorize new Blueprints in the Place Mode UI

I’ve created a bunch of new Blueprints for designers to place into their levels, but I’m unable to create new categories in the Place Mode UI that neatly categorizes them. I can’t seem to find any documentation about how to do this. It would seem that “Blueprint Category” on the blueprint’s “Class Settings” should do this, but specifying a category there doesn’t appear to do anything. I tried specifying categories there and re-starting to editor to see if they’d take effect, but nothing seems to happen.

I’m not sure if this is a bug, or if that’s not what “Blueprint Categories” is supposed to do. But I want to make sure designers have a very easy time finding all the tools available to them without searching the Content Browser for blueprints - is there a way to do that?