Omarchy OS: How do I choose which monitor is primary?

Arrange outputs and preferred workspaces in Omarchy’s Hyprland monitor configuration.

Open Setup > Monitors and edit ~/.config/hypr/monitors.lua for each display’s position and mode. Omarchy’s manual also points to Hyprland’s workspace rules if you want particular workspaces on a particular screen. Which monitor has focus controls some actions, including brightness keys.

Source: Omarchy manual.