Unfortunately, despite there being a free scaling option in the Heavensward benchmark, this UI has not been addressed in the actual expansion client. I'm a bit frustrated, this problem has been known for a long time now. Now that I have a 980 Ti, FFXIV is now literally the only game I have to play in 1080p and it makes me sad. I wish we could at least get a dev comment on it this will ever be addressed or not.