Please don't forget to turn it on when you are sharing your presentation through the PowerPoint's live feature. Otherwise, your audience can scroll through and see all of your slides without you even knowing.
That's what I did two weeks ago during an important call and left it 2 minutes later as there was nothing of interest to me. Or at least, that's how it looked like. And that's the problem. Because there might have been something, but I was not there anymore...
You don't want that for yourself when presenting. Use this feature.