Only a host can assign people to breakout rooms. Remember that only desktop versions of the Zoom app can create and manage rooms. These requirements mean that at least one participant should have a computer to host the Zoom app. Users on a mobile version can only Join a room that a desktop Zoom app has created. Hosts can pre-assign participants by using the Schedule meeting option or split them up during an ongoing meeting. Participants also have an option in their menu that allows the host to create and assign them into breakout rooms.