This is not a tech support forum, for one.
For two, this is not enough details to go on.
What graphics card are you using? What is the monitor, and what it it's native resolution? Playing in fullscreen, window, or windowed fullscreen?
Any support is going to need details to even begin to GUESS how to help you.
I have an rtx 3060 my monitor is and MSI mag301rf it's native resolution is 2560x1080 and I play in full screen
Fullscreen will list the options that the game, your video card, and monitor combo can do. Mine for example is only 2 options with my RTX 2060 and my monitor (I need a new monitor), either 1360 x 768 (native) or 1280 x 720 (in 16:9 native ratio, which is best to leave that native to avoid stretching the image in one way or another.
When you click thru the options, what ones do you have?
But why would you NOT want to use your Native resolution, which is more resolution (and screen real estate) than your old one?
I can select 1728x1080 but when I do it goes black screen and the reason I don't play native is because I've always played stretched I'm more consistent when playing with a stretched res
Well, the black screen is because it's not really supported with recent driver updates most likely. Roll your NVIDA drivers back one build and see if that works.
Or get used to playing not stretched and use your native.
Past those ideas, you would need to open a proper ticket with support for more technical support. I would not recommend sharing DxDiag results publicly.
