Steam’s latest client beta update added more support for Sony’s new DualSense controller. You could use the DualSense with Steam before this update, but most of its features weren’t included when you synced the new controller up with your PC.
“Added additional support for the PS5 DualSense controller including LED, trackpad, rumble, and gyro functionality,” read the notes from the update. Support for the directional swipe feature was also included.
This is the Steam Client Beta, where Valve tests new additions to their platform, so it’s not available to Steam users who haven’t opted into the beta. We could see official support come to all users soon based off how quickly they’ve added support for the DualSense. Hopefully we’ll see support for the adaptive triggers soon as well.