Launch Steam.
Go to your Steam library.
Search for the game and right-click it.
Select “Properties.”
Click on “Set Launch Options.”
Write “ -screen-width 1920 -screen-height 1080 ” (without the quotation marks, also use your own resolution instead of 1920x1080).
Save your settings and launch the game.
In the menu, don't change the resolution or the screen, it will launch in the desired resolution this way.