Date: 13 April 2021
Title: Multiheaded display

I managed to get multi-headed display going pretty easily.

pacman -S arandr

This pulls down a gui for setting screen resolution and screen positioning. Just run

arandr

This gives you a nice GUI to configure your screens and for me 'just worked'. Next step will be for it to default to this configuration whenever the system detects it has a second screen enabled.