How to only show quest objective mob names?

[CntrlAltDel]

I haven't played WOTLK since Cataclysm released. Last I remember when I was questing I was always able to identify quest objective mobs by their name above their head being red and all other mobs hostile or not have no names above their heads.
Now that I'm back I can only set Interface > Names > NPC Names (Check) for all mobs to have their names above their heads.
Is there a way to enable a feature of this sort again? I might've done something a few years back but I have no recollection of what it was to get it to work

[Radvo]

That's a cata+ feature from the blizz UI ... It's not available for WotLK and afaik there's no addon to make it happen..

[CntrlAltDel]

That's a cata+ feature from the blizz UI ... It's not available for WotLK and afaik there's no addon to make it happen..

Then I must've confused it with WOTLK. Thanks for the response.