Valve has released SteamOS 3.3 along with a stable, updated version of the Steam Deck client.
The new version of SteamOS has plenty of new features as well as bug fixes.
Another useful feature is the system update channel selector, making it easier to change between stable, beta and preview versions of the Steam Client and SteamOS.
Following Valve’s warning a couple of weeks ago about the Steam Deck’s performance in high temperatures, temperature notifications have been added which warn you when the console goes outside of the safe operating range.