Whether to show the full screen button or not. Defaults to true if your account was created after September 11th, 2019. False otherwise.
By default, we don't show the full screen button when you're using seats.io inside an iFrame. That is because we have no control over the size of the iFrame. You can still show the button by passing in
showFullScreenButton: true, and implementing onFullScreenOpened() and onFullScreenClosed() if necessary.