By adjusting the slide settings, presenters can poll their audience without revealing the results on-screen.  

Step-by-Step

1. Sign into the session as a Moderator
2. Click the poll question
3. Click Configure Embedded Slide
4. In the On-screen Poll Behavior window, select a Countdown timer option or Manually advance to results 
5. Select No, Hide Results of Poll: 
6. Click Save

The poll slide will now show a message where the results would have otherwise appeared.