New PowerPoint versions have made Widescreen (16:9) as the default aspect ratio for new presentations. Although you can change all these new presentations from Widescreen (16:9) to Standard (4:3) aspect ratio quite easily, it can be a pain to remember doing so each time you create a new presentation!
To learn more, choose your version of PowerPoint. If we do not have a tutorial for your version of PowerPoint, explore the version closest to the one you use.
Microsoft Windows
Set Standard 4:3 Aspect Ratio as Default in PowerPoint 2016
Set Standard 4:3 Aspect Ratio as Default in PowerPoint 2013
Tutorial Code: 01 11 02
Previous: 01 11 01 Widescreen Defaults in PowerPoint
Next: 01 11 03 Change Aspect Ratio from Widescreen to Standard in PowerPoint