Disable audio/video preview in waiting room

The release notes for the 3.7.0 SDK mention the following enhancement to the Client view:

  • Enhanced the waiting room and waiting for host preview so that you can disable preview or prevent attendees who join the webinar from seeing video and audio preview.

Does this mean you can now disable the audio and video preview from the waiting room / waiting for host room when joining a regular meeting? If so, how do you do this?