Other people as Host

Once the meeting has started open the participant list and click the ... next to the participant name you want to become the host. Then make the appropriate selection.

Before a meeting starts go to the web portal and turn on "Allow participants to join before host". Before the meeting give the host key to the participant you want to be host. They can use the host key to take control of the meeting. The host key can be changed at any time in the web portal account profile.