You can also add some URL params to open in a specific way:
https://discourse-on-a-pi5.falco.dev/resenha/r/watercooler?join, just enters the room, no click to join button
https://discourse-on-a-pi5.falco.dev/resenha/r/watercooler?join&widget (added earlier this week), opens and turns into widget mode
https://discourse-on-a-pi5.falco.dev/resenha/r/watercooler?join&chat opens in chat mode