The Broadcast is a feature that allows Admins and Moderators to broadcast a message to all breakout rooms at the same time.
This button is located at the bottom panel.
How Broadcast feature works
This feature can be helpful when you need to make a quick announcement to all participants in all Breakout rooms (excluding the main room).
To use the feature simply click on the Broadcast button at the bottom panel. You will be asked to confirm before the Broadcast begins.
When you start broadcasting, your image will be shown in every room and every participant in the upper left corner of the screen.
You can also turn off the camera and only use the microphone for broadcasting. Then, instead of your image, such a sound wave will be shown.