no, Big Picture mode and Game Mode are two different things. Bazzite does have Game Mode for PCs tho as well.
GameMode is Feral Interactive's project, and not what we are talking about.
However, a bit of searching turns up relevant info from Bazzite:
- Steam Gaming Mode is another name for gamepadUI.
- It is built from Big Picture Mode and Gamescope, just as I suggested.
- The interface is apparently available without loading Steam's full desktop interface by launching Steam with the
-gamepaduicommand line option.
Looks to me like what you're talking about and what I suggested are practically the same thing, perhaps excluding Deck-specific features that wouldn't be available in kolanaki's scenario anyway. If there's something more to it, then sharing what that is would be helpful.