Hello and welcome, you might find
this thread and
this video interesting ;)
This is not a "resolution" problem, your three monitors use the same res. It's just that objects on the side panels may look a tad bigger/closer than they really are. All games are affected in the same way.
So the wider your screen gets the more obvious this distortion appears ... and it is just the way game cameras are ... it isn't an added feature of the TH2G ... it is already there.
Peripheral vision is for immersion, not precision ;) so you shouldn't turn your head and look at your side panels. Hopefully you'll get used to it and focus on your center screen, and turn your camera angle if you catch the glimpse of an enemy on the left/right screen...