Steam Deck Client and Beta Get New Updates For Fixes and New In-Game Shortcuts - Steam Deck HQ
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There were new Steam Deck Client update for the stable and beta branch with bug fixes and new in-game shortcuts.

I’m kinda amazed it took this long, but valve finally added:

Added in-game keyboard shortcuts to open the Main Menu and Quick Access Menu.

Default Main Menu hotkey: Shift+Tab
Default Quick Access Menu hotkey: Ctrl+Shift+Tab
Customizable in Settings->In Game
  • RussAEnglish
    3·
    3 days ago

    Kind of. You could only open the menus IIRC when you were not in a game, can’t recall the exact key bind though. At least, this was the case when I tried replicating the gaming mode session on my PC (I haven’t actually used a keyboard on my deck either). It was quite strange.