usability (unclear) when setting up the BBB widget

When setting up the BBB widget, the usability is a little unclear. If you set up the BBB widget as a matrix room admin, you first have to click on the “Set up meeting” button and then on the “Join meeting” button. If I want to join the BBB room as a normal user, do I also have to do this in this order? In my opinion, it is not clear whether a BBB room already exists or not.

Perhaps it would be helpful, if a BBB room already exists for the matrix room, to display only the button Join meeting?