One of the biggest problem of red dead redemption 2 is about full screen bug . for some players game on the Vulkan always starts in windows borderless mode and if you turn it to directX 12 , the problem of full screen will be solve but game will crash and freeze really bad in some cases .
so here is the solution :
- Right-click on the desktop and click NVIDIA Control Panel.
- On the NVIDIA Control panel in the left tab, click on Change Resolution, The resolution list choose a lower resolution, click apply. After it, change back to 1366×768 (same as windows resolution) and apply again.
But for some reasons if you can’t find this options in your NVIDIA control panel then answer is in other graphic program that is controlling you graphic .
I have NVIDIAa Gtx 1060 but i realized that my resolution option is in Intel control panel . so open the Intel control panel ( if you don’t have resolution option in your NVIDIA control panel ) and change the resolution from 3840×2160 to 1920×1080 ( or lower ) and game will be start in full screen .