SteamOS 3.5 has just been released to the Preview channel, and includes new features that are still being tested. You can opt into this in Settings > System > System Update Channel. Display The default color rendering for Steam Deck has been adjusted to emulate the sRGB color gamut, resulting in a s...
You can now configure Flatpak app permissions via KDE System Settings -> Applications -> Flatpak Permission Settings. It basically does the same thing that Flatseal does, except it now comes out of the box. No need to install a separate app.