GPD Win is a small (5.5 inch screen) handheld device. More information about the GPD Win can be found here: https://hansdegoede.livejournal.com/17445.html
Reboot holding either
Esc to enter BIOS. From the BIOS screen, either change the boot options to prioritize your USB drive or boot from it once.
On the Arch Linux boot option screen, with the first option highlighted, press
e to edit boot options and add
fbcon=rotate:1 for screen to be rotated correctly.
Remember during installation:
- The storage device is
fbcon=rotate:1option should be added to the kernel parameters via your boot loader.