Some players were having issues with the game automatically defaulting to 1080p resolution on launch with incompatible monitors.
The game now automatically detects and sets your monitors highest supported screen resolution at launch, which includes ultra-wide and 4k supported monitors.
The game is very well optimised so it should run fine using your native resolution. If however you're finding the game to run choppy. You can lower the resolution using the buttons in the lower section of the UI menu.