Rotating OS screen to portrait mode

Hi, just installed home assistant using a x86 small form factor pc. HDMI output to a Dell 24inch screen in portrait mode. How do i rotate the CLI (not the front end/dashboard view, just the base linux/HAOS view) to be in portrait mode. Research here suggests config.txt in boot directory. I cannot find config.txt or the boot directory in HAOS. HAOS version 11.4, Home assistant core: 2024.1.3. Any suggestions?