To enable screen sharing, click the Screen button during the video conference.
Select which screen or browser tab do you want to share > click Share.
In the Speaker mode, if there are more than two people participating in the video conference, you can pin the colleague's or guest's window.
While the screen sharing is on, a special panel will be shown to notify you about that. To disable showing your own screen, click the Stop button on the panel or the Screen button.