Correct me if I'm wrong but Hyprland is Wayland so xrandr is no go.

There are some utilities for this though. nwg-displays comes to mind

Yes, but you can have a similar setup to what he is describing, just with different commands.

I'm using niri instead hyperland. I can either use `sed` on it's configuration file (on/off, resolution, position) or for some of its configurations I can use the cli (for output scale).