While in a virtual group, both facilitators and attendees can swap between portrait and gallery mode using the control in top left-hand corner.
Presentation mode focuses the main portion of your screen on the content, while gallery mode shifts the screen to display up to 16 different tiles comprised of the video, your camera view, and up to 14 other attendees.
Gallery mode allows up to 14 other attendees to be displayed on-screen. If you have more than 14 attendees, the most recently active speakers will be in view.