You can watch it on your phone fullscreen.
Here are the ways to watch the show:
When in Portrait mode, you can watch the show and interact with the community and creators at the same time but the video player is smaller.
When in Landscape mode, you can watch the livestream on full view. Make sure that you enable the screen auto-rotate feature on your mobile then just turn your phone to the side and the player should go on fullscreen automatically.
For the best experience, view the livestream in Landscape mode. Don't forget to click the Unmute button!