Have you ever paused a presentation to talk to your audience, but found them distracted by what was still on screen? You can black out (or white out) a presentation anytime you want with a simple keystroke.
Part of being a good office professional is giving presentations that don’t bore your audience to death but also don’t distract them from the message you’re delivering. Sometimes you want the audience to focus on you and what you’re saying—or watch a practical demonstration. Or maybe you’re just taking a break in the middle of a long session. Whatever the reason, sometimes it’s useful to be able to show a blank screen rather than a presentation slide.