Using the visibility property to add/remove video chat panels in a room

For a workshop event I would like to switch between a presenter layout (1 video chat panel for presenter) and a panel discussion layout (3 video chat panels for panelists) in my room. Three questions:

I'm using the property visible to turn some video chat panels on/off. It's hard to use the "snapshot" functionality this way since the element disappears and can't be selected (for the snapshot). As a result I have to go manually into the action editor and add a row. Is there an easier way to do this?
When setting visible=False for a video chat panel (in director mode) the person in the video chat will still be assigned to that panel (but is invisible). How can I ensure that the person will be removed from that panel? (and nobody can drag themselves into the invisible panel)
Instead of messing with the "visible" property, could I just move elements off-screen? Would this have the same effect or is this not recommended? (due to things still being rendered etc.)

Thank you!