During your events, you can use the picture-in-picture feature. All you have to do is detach the video window with this button:
You will see a floating video and audio window with no need to use an external monitor. You can freely move it around to simultaneously see, for example, the shared material and the meeting attendees, or use other programs or browser tabs during the event without worrying about losing contact with other attendees.
For more information about the floating window, visit this page.