How do I track if participants are actually paying attention?

Edit 05/19/2020: The feature written below is NO LONGER AVAILABLE which started on April 2, 2020. The 'Attendee attention tracking' feature was removed by Zoom as one of their answers to address the security and privacy issues that they've been dealing with for some time. Check this link for the official announcement. Cheers.

"There is something that's called 'Attendee attention tracking'. When a participant/attendee doesn't have the Zoom Mobile app or Desktop Client 'in focus' for more than 30 seconds ('In Focus' means Zoom meeting view open and active for more than 30 seconds) during screen sharing, the Host will be able to see that in an indicator from the participant panel of a meeting. It can only track attention while someone is sharing a screen and doesn't use audio/video tracking.

You can enable Attendee attention tracking by going through these steps:

1. Visit and Sign in to Zoom's web portal
2. Click on Settings
3. Look for the Toggle for Attention tracking, switch it on

To use attention tracking:

1. Sign in to your Zoom Mobile app or desktop client
2. Start or join a meeting
3. Select Manage Participants
4. You'll see an indicator next to the name of participants who don't have zoom in focus for 30 seconds."