Set the stream title in Twitch
The title of your live stream in Twitch is set from your Twitch channel page in the stream information. You can find that under Settings on your Twitch Dashboard. See the online help in Twitch for details.
The default Webcaster X2 title that is usually used for live streams to YouTube and Facebook doesn't apply for live streaming to Twitch. As such, the option to change the stream title isn't listed in Webcaster X2's preferences when Twitch is the selected streaming platform.
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