i have a triple monitor setup and my third monitor is vertical/portrait and it's connected to my gpu via vga and a vga to dp adapter because my 2 other monitors are occupying the hdmi ports. I tried setting the resolution to 1080x1920p but the option isn't there and i know that this monitor's native resolution is 1080p. i used to use a vga to usb-c adapter and it worked for a bit but my case was blocking the gpu's port so i could no longer use it