Can't change New Rust resolution!

Right now I’m using 19201080, but want to switch to 12801024… Sadly I cannot because it darkens my game and also makes it so the game is out of sync with my monitor… Please any fix? : (

In steam open Library
Then press right mouse button
Then press Properties
Then press change launch options

In there paste this -force-d3d9

Press ok and start RUST now. You will run now in DX9 but its better than full resolution. My pc
is going crazy at the moment at full res.