[SOLVED] how to make trashed categories really disappear ?

Hello,

I delete some of the categories, most of them are come from the demo package, but those categories still show up in the select category list.
They are gray out and marked as [Trash], but I would hope they can really disappear from both back-end and front-end.
Can someone help ?

Another question is how to make the "secondary category selection " gone in the submit article view if I don't need secondary category?
I disable it but it become "locked" in the submit page, I would like the selection just not show in the site.

Thank you!

hello for trash => filter by trash state and after you can delete for real