I've left mine at default on BF1 - I think it adjusts for the 21:9 aspect anyway so any further adjustment isn't really necessary.
I should mention it's not just new games which support 21:9 properly. Even Borderlands 2, which is over four years old now, supports 3440x1440 perfectly and looks amazing.
I should mention it's not just new games which support 21:9 properly. Even Borderlands 2, which is over four years old now, supports 3440x1440 perfectly and looks amazing.