// Taken from: https://blog.summercat.com/configuring-mixed-dpi-monitors-with-xrandr.html
Dual monitors
When I want to use both monitors, this is the command I run:
xrandr --dpi 276 --fb 7040x3960 \
--output eDP-1 --mode 3200x1800 \
--output DP-1-2 --scale 2x2 --pos 3200x0 --panning 3840x2160+3200+0
Here's an explanation of the options: