You can absolutely change your camera or mic at any point during the broadcast by accessing your audio and video settings in the Greenroom. To switch devices, just follow the steps below.
Select the My Info icon at the top right corner.
Choose "Audio & video" from the menu options.
Then select the camera or mic you'd like to use from the list of available devices.
That's how simple it is to switch between devices. This flexibility allows you to ensure your best devices are always in use, even if you need to make that decision half-way through the event.