We often use Webex Events for panel discussions. The host is usually not part of the discussion, and takes up screen space in the grid view. Sometimes there are other people who need panelist roles (Q&A moderator, panelists who will be joining the discussion later, etc.) but who don't need to show up in the grid view for attendees.
This could be done by hiding all panelists that don't have a video feed from view, but it would be better if the host could hide panelists individually.
For our events, we usually have:
A host. The host is attending to technical aspects of the event, not part of the show.
A presenter. This person is sharing content, but doesn't need to appear on screen.
A moderator or emcee. This person introductes panelists, relays questions from the audience, and addresses the audience about the event. Ideally the moderator would not be on screen while the panelists are talking.
One or more panelists. These are the people that the audience is there to see. Sometimes we have more than one set of panelists. A graduation ceremony is an example - there are several speakers, one at a time. Or an orientation, where there are several short panels talking about different related subjects.
We want a way to hide all the panelists that aren't "on stage" from view, so that the audience only sees the ones that are part of the active discussion. Something like a virtual green room.