Since Hyprland still supports wlr-output-management (AFAIK) you can use tools like wlr-randr and nwg-displays. I don't use Hyprland but I used Sway for many years and support for multiple outputs was top notch. You did have to edit your text-based Sway config file, since a major part of the draw for Sway was an i3-like mantra, but you could do declarative configuration for both output and input devices, and it worked well with hot plugging. Combined with handling mixed DPI setups better, the general situation feels a lot better for using multiple monitors with Linux these days.

Editing a text file to configure displays is definitely an acquired taste, though. Maybe Omarchy needs some utilities to provide a UI around those config files.