I just got myself a 2560x1080 monitor last night, also 3 screens in total - but i'm only using the 2560x1080 for ED. I did get some additional view on each side, but not enough to see the panels. My guess is that "ultra-wide" is quite a bit larger than 2560x0180. Perhaps try Nvidia's surround monitor configuration to use all 3 screens simultaneously, you'd probably see a lot more on the sides.