This should be fun in tallscreen... Is there always a foreground like that ? I'd say the Vert loss and invasive graphics amount to a major flaw in Ultrawide. WS on the other hand is vastly Hor+, so that counts as Hor+ and 4K is A-OK. It seems safe to assume that the game was designed with 16:9 as a baseline.
I only played the first Level - no the "stupid" foreground (black grass) is only in the startpoint once you jump up or go down to the lower Level the view is normal/clear. But again a Unreal Engine 4 Game where only cheatEngine can do the difference. I tried a lot Hex edits and ini edits to alter the view - no success so far. From Unreal Engine 1 - 3 you could Console edit, ini edit and hex edit but UE4 is a nogo