Try and use wlr-randr for screen manipulation. If you've used xrandr before the syntax is very similar (although there are a few differences so it may be a bit more difficult than just changing the process name in any xrandr scripts you are using). For example

wlr-randr --output eDP-1 --mode 1920x1080

Good luck with the X11 -> Wayland transition, I'm sure a lot of us need it!