By default, PowerPoint slides use a widescreen format in a 16:9 ratio. If you’d like to change it to the standard format (4:3 ratio), or even create a custom size, PowerPoint provides a quick and painless way to make this happen.
Resizing the slides in PowerPoint will affect the way they appear during the actual presentation and how they appear on the handouts. Go ahead and open up the presentation that we will be resizing and select the “Design” tab.
