What If You Don’t Like the Default Size 16:9 in PowerPoint 2013?
Currently, when opening a new slide in PowerPoint 2013, it will open by default to a larger sized slide. Instead of the traditional 4:3 dimensions most people are used to, it opens as 16:9 by default.
There isn’t a way to change any settings or option if you prefer to stick with the 4:3 dimensions, but here’s a work around.
Watch this Video for the Work Around to Set 4:3 as Your Default Slide Dimensions
Written Directions – Work Around to Set 4:3 as Your Default Slide Dimensions
From the Design tab and over in the Customize Group, click on Slide Size.
Select Standard (4:3).
In the group called Themes, press the down (more) arrow in the bottom corner of the group. Select the last option Save Current Theme.
Give the theme a name. (By default, PowerPoint will save the theme where it stores the other themes on your hard drive. That location is fine.)
Now in the Themes group, the new theme will appear with the name you gave it. (You’ll see the name if you hover over the theme.)
Right click on your new theme. Then select the option Set as Default Theme.
When you reopen PowerPoint or go to create a new PowerPoint file, your new default theme will stay with the 4:3 dimension selected.