The Steam Deck Client Beta has been updated with the following changes: General Steam developers can now select which Steam for Linux runtime to use for native titles. Please consult the partner site for more details. Native titles will execute in 'Steam for Linux runtime 1.0 (scout)' by default, instead of the legacy runtime environment. This behavior is consistent with Steam Deck and promotes better compatibility across all Linux desktop distributions.
SteamDeck公式情報
Steam Deck Beta Client Update: October 17th