The Stable Channel (default) has been updated for the Steam Deck including the following fixes:
General
Reduced startup time for users with tens of thousands of games in their library
The Virtual Keyboard in the Overlay now remembers its last position
Added settings for an initial location to show the keyboard on the desktop and in the Steam overlay
Added fast jump by letter to library
Fixed Chord Hint Screen remaining shown after holding the guide button to turn off a controller in some scenarios
Fixed small movement of Virtual Keyboard when pressing shift in some themes
Steam Input
Fixed some inputs not showing up for the Steam Link App Touchscreen controller
Fixed several instances of Left Bumper/Trigger glyphs having the wrong background image
Fixed an issue where a Team Fortress 2 Steam Controller startup sound was missing
Fixed some issues with Nintendo switch gyro drift calibration
Desktop Mode
Reverted back to the old Game Info dialog that is accessible from the Friends List
Added alt-enter as a hotkey to exit Big Picture Mode
Fixed Big Picture Mode window not re-opening from double-clicking or selecting system tray menu options
Fixed Big Picture Mode window not displaying properly due to web GPU acceleration being disabled
Fixed issue where exiting Big Picture Mode would log out of Steam Chat
Fixed crash when opening the Steam store
Fixed Steam library becoming unusable after applying a controller configuration