When an Attendee joins an event, they'll be brought to the Webinar Room, with the main Presentation front and center!
Directly on the right, they'll find the Chat Box where they can engage directly with the Presenters and/or the other Attendees.
The chat area will display any Polls/Handouts that have been shared by the Presenter.
By default, Attendees can only see what is shared by Host/Coordinators. But, you can pass them the webcam and microphone rights at any time: Managing Attendee Devices (Webcam + Microphone)
When an Attendee is invited to the stage, a pop-up notification will be displayed.
After Going on Stage, Attendees will find the option to turn on/off their devices directly from the bottom, or leave the stage, like so: