I'm a Zoom host, using Windows 10 Home on a laptop. Sometimes my participants complain about seeing gray boxes on their screen. This happens when I share a process that is showing an image or video full screen. These boxes could be caused by various windows on my computer: the two rectangular Zoom meeting control rectangles, the Zoom Participants box, the Zoom Chat box, or other apps such as file explorer or browser. When I share a full screen image or video, I want my participants to see only that, not additional overlaying gray boxes. Is there a setting for this? If not, when are the gray boxes shown and when are then not shown? Note: web searches show no information about gray boxes or rectangles caused by Zoom.