If you're using the PowerPoint mobile app, you just have to tap the magnifying glass icon at the top of the screen. PowerPoint can find any typed text, but it can't find text that's part of an image.

1] Hide text in PowerPoint until you click anywhere It’s very easy to create a system that reveals text in a PowerPoint document whenever anywhere is clicked, so let us explain how right now.

You can make a picture transparent in your PowerPoint slides so that you can add text over it or use it as a background.