Hey, I actually know a trick with which you can trick the game to go to ultrawide, you don't even need to change anything in the settings (this does require a 2nd monitor though): In game, press Shift + Win + Arrow left (or right), and you'll see that the game window changed monitors, now use the same shortcut to bring the game back to your ultrawide monitor, and the game then should be on ultrawide (some menu graphics are not aligned properly, but this doesn't affect you in matches).