Howdy!
I was running 3.9.1 and just upgraded to 3.10.1. Both prior to the upgrade and now, I haven't been able to delete categories - which is what I believe "Purge Category" is meant to mean, but I don't see any documentation around this.
The Purge Category button seems to do nothing, in any category. I can't find any way to delete categories I don't want, and after creating a new test category I can't get rid of it either.
Am I missing something, or is there something I can do to find out why the button seems to do nothing? (This is happening in both Firefox & Chrome desktop versions on Linux, and when looking at the developer tools in Firefox there's not really anything that seems to happen anywhere when I click on the button - but, I'm not an expert at debugging sites, so I could easily be not doing the right things to get useful information out of it)
Sorry about that - yup, that got it. Thanks so much for the clue bats!