Must be an integer from a resolution the game supports. Pair with -screen-width.
Example
-screen-width 1920 -screen-height 1080
Display
Unity EngineAdded Jul 8, 2026Last checked Aug 21, 2026
Safe
gamemoderun %command%Copy
Run the game under Feral GameMode (Linux)
Effect
Applies temporary host optimisations (CPU governor, I/O and process priority) for the game's lifetime, then restores them on exit. GameMode runs the game, so %command% is what it runs.
Proton-Deck
Feral GameModeAdded Jun 29, 2026Last checked Aug 21, 2026
Safe
-popupwindowCopy
Run in a borderless window (Unity games)
Effect
Creates the window as a dialog with no frame. Not supported on macOS.
Takes exclusive or borderless. Windows only. The flag alone does nothing — the value is required.
Example
-window-mode borderless
Display
Unity EngineAdded Jul 8, 2026Last checked Aug 21, 2026
Safe
-force-openglCopy
Force the legacy OpenGL renderer (Unity games, legacy builds)
Effect
Windows only. Selects Unity's LEGACY OpenGL backend, not the core profile — use -force-glcore for that. Builds made with newer Unity versions may not carry the legacy backend at all, in which case this has no effect.
On the General tab, find the Launch Options field.
Type or paste the option (e.g. -windowed) into the field. To use several at once, separate them with spaces (e.g. -windowed -novid).
Close Properties. Steam saves automatically, and the option applies next time you launch the game.
To remove one, reopen the same field and delete the text. Options are game-specific; an option that helps one game may do nothing (or misbehave) in another.
Worth knowing: a launch option can break a game's rendering, reset local settings, or trip anti-cheat in multiplayer. Read the description first, add one at a time, and treat anything rated above Safe as a deliberate experiment.
