When live streaming a conference, we bring a direct feed from the projector to our video mixing desk. We might have a wide view of the presentation during the presentation, including the speaker and the screen.
This is fine where the side content is a general header, but if it contains detail, the producer might opt to display the slide as the primary visual element with the speaker’s face in the top corner to avoid losing engagement. So please keep in mind that this area of the slide may be covered by the speaker’s head.