Right click a Zoom input and select Zoom Manager to display the chat window for the meeting.

The chat window will allow you to communicate with each participant and also show important information about the current meeting, such as who has joined and meeting information such as join urls and meeting IDs and passwords if applicable.

The top section of the window will also display statistics about each participant currently assigned to an input in vMix, including the current resolution and frame rate of the video and/or share they are sending.

Participants List

The list on the right hand side shows all the participants within the current meeting.
Participants with a red icon denote participants who are currently assigned to a Zoom input in vMix.

Right click a participant to do one of the following:

Add Participant as new Input
Assign Participant to Input