Everything works fine for me (and most users). YouTube is currently A/B testing a new layout for livestreams, where they display chat next to the video in their theater mode. If your issue is with the layout (empty spaces, wrong chat and video size), try using YouTube's theater mode. I will make the extension work with this new layout as soon as it is released for all users. If you're experiencing a different issue (e.g. livestreams theater mode not becoming available), you could send me more details through email or my discord server.