Whitheboard

@ADRIC55 - I am assuming by client you are referring to the other participant.  For whiteboards (and screen share), the view on the participant's side is controlled by them.  They should always be seeing you if you have video on, but they can choose to view the participants either in speaker view (only the active speaker), or group views (Everyone).  The participants would be shown at the same time as the whiteboard.