YouTube already has this option for their mobile app with livestreams, I was appalled when I couldn't make the chat go full screen on the Twitch app on my phone the same way. You would think Twitch would have at least this basic functionality for streams on their app since everything is about livestreaming on Twitch and being able to see and interact with the chat as a big part of livestreaming.

When I’m trying to type in chat in mobile I can only see a tiny sliver of chat, so if the play button and audio signal could be hidden, or if chat had a full screen mode, I would be able to catch more messages while typing. It would also help me catch errors in my message in faster moving chats, since I have to close my keyboard in order to see more than 1 or 2 messages, and by then the message is gone.

Please fix chat only mode in mobile. Add option to fullscreen chat.