I have just tested it and it is working for me (checked in Chrome and Edge). Do you have any browser extension that could be conflicting with it? Can you provide a step by step (maybe with screen shots)? (you can send it to me by direct message)Current Build-your-scene build looks to be bugged. Checked on multiple browsers. Select characters screen pops up. Once you either select and confirm or dismiss, the other controls are unavailable.
Maybe you can also check the console to see if you are getting an error and let me know.