In this example, you’ve already entered your VMR and are a host.
Locking the conference prevents additional guests from entering the conference. If a conference is locked and a guest tries to connect the conference the host(s) will receive an on-screen message and audio message for each participant attempting to join.
Selecting this option mutes all guest and adds a mute icon to the conference avatar. Other hosts are not muted.
This selection will disconnect all parties, including yourself, effectively ending the call.