Omarchy OS: How do I install an app in Omarchy?

Use Install > Package in the Omarchy menu, or run omarchy pkg add with a package name.

Press Super + Space, choose Install > Package, and search for the app. For packages from the Arch User Repository, use Install > AUR and review what you install, because AUR submissions are community maintained. In a terminal, use omarchy pkg add package-name.

Source: Omarchy manual.