We have just shipped an updated Steam Deck Client to the Preview/Beta channel.
General
Improved the layout of the pair controller screen on Steam Deck
Fixed an issue with joystick LEDs not working correctly on Legion Go in some cases
Steam Controller Firmware
Added support for dimming the LED via settings in Steam
Reduced internal deadzoning on the lower-range of the triggers
Steam Input
Added support for dimming the Steam Controller's LED
Fixed some cases where returning to the "Edit Layout"...