What's new in PowerPoint 2013-3 - Aspect ratio change default to 4x3

If you want to change the default aspect ratio in PowerPoint 2013 from 16x9 to 4x3, proceed as follows:

Start a new presentation and choose the blank presentation theme.

Change the format to 4x3 by going to Design tab and in the Customize group click the Slide size button.

Click on Standard (4:3)

Again go to the Design tab - Themes group - click on the More button.

Click on Save current theme.

Save the theme in the Document themes folder (PowerPoint should take you there automatically) with a suitable name.

Now go to the Design tab again, in the custom section right-click on your newly created theme and choose Set as Default theme.

Now close PowerPoint and start again.

You should find your new default 4x3 theme as the first theme. Click on it and you are ready to go.