Video feed panel needs to be adjustable

Video feed panel needs to be adjustable

When screen sharing is enabled, the video feed occupies a portion of the screen of the participant making the screen share smaller.

This is worst if no one transmits video, as the participant just sees a number of black boxes occupying the screen.

The video feed panel needs to be adjustable or retractable, so that one may choose to keep both or remove the feed and increase the shared screen size.