Infinite screens occur when the screen of the webinar room is shared with attendees, causing a repeating loop of reflected images.
What is an infinite screen effect?
If the screen of the webinar room is shared with attendees it causes an infinite loop of reflected images, kind of like a mirror at a funhouse. This is easily resolved by switching away from the browser tab that is hosting the webinar room.
To keep it from happening, hosts should use a separate monitor just for screen sharing or share a specific tab or application window. Find out more about the infinite screen effect here.