Why can't I hide quests from the tracker?

[Uielyave]

I have a permanent imprint on my UI of the quest to beat up Titan EX. It's been there for MONTHS. I can't get rid of it. Please help me, Square Enix =(

You and me and probably a large number of people as well. (
In WoW we had a little button on the side of our quest list where we could hide the bulk of them from the screen. We could also uncheck them to hide them from the quest log. Either, if not both of these, would be excellent.