Via their console dashboard.
Taken from Engadget … Microsoft is following up on a promise to improve Twitch livestreaming on Xbox consoles. As of today, Xbox Series X/S and Xbox One owners can stream on Twitch directly from the system Guide. Once you’ve linked your Twitch account, you just have to choose a “go live now” option to start broadcasting. You also have access to some streamer-friendly options, including the bitrate, resolution, title and separate audio levels for your game and microphone.
The integration is smart enough to automatically pause your feed and change show titles if you switch games, and you can decide whether or not you want viewers to hear your party chat. Your Xbox friends can also choose to receive alerts when you go live on Twitch.
This kind of tie-in wasn’t surprising. Microsoft shut down Mixer nearly two years ago, leaving Xbox users without a truly integrated livestreaming option. The Twitch app filled that gap, but required significantly more steps to go live. This makes it more viable to stream on an Xbox, and might help Microsoft compete against Sony’s relatively strong Twitch support on the PS4 and PS5.
Source: Engadget