it the type drop down the Item Set type is missing
it is item type 18

Are you talking about in the search filters? It is there it just seems to have been renamed to "Armor Set" also scroll seems to have been renamed to "Skill".

In the actual editors it should be named correctly. Also this need to match (value wise) the db which it currently does, that doesn't mean the db is 100% accurate though.

is that a value you type manualy in the editor that is
maybe you could add the type id in it parenthesis just like class is done

and just armor set is misleading since
armor sets are set of armor
item sets are sets of items,

they both use item type 18

that field is so wide maybe change armor set display to Item/Armor Set, and
change skill to Spell or Spell Scroll, what does it have to so with skill lol