Short answer
Open the Omarchy menu with Super + Space. Choose Install > Gaming > Steam.
Steps
- Open the Omarchy menu with Super + Space.
- Choose Install > Gaming > Steam.
- Launch Steam from the app launcher (Super + Space). It can take 10 to 20 seconds to start with no visual feedback.
Valve's Proton compatibility layer runs tens of thousands of modern Windows games on Linux. [omarchy.org]
Source
From the official Omarchy manual, checked 2026-10-19. Steam is not a package in the Omarchy repo, so it has no app page here; for repo apps use the apps list.