Change the default font and style for shapes in PowerPoint

To change the default style or font for shapes, follow the next steps:

   1.   Create a new shape in your presentation:

On the Insert tab, in the Illustrations group, click on the Shapes dropdown list and then select any shape you prefer:

PowerPoint will add the shape with the default style:

   2.   Apply any formatting. You can change the fill color or add an effect, change the text color, style, or weight of a line, or make any other changes.

For example:

   3.   Select the shape, right-click the border, and then click Set as Default Shape on the popup menu:

Next time you add a new shape, PowerPoint will use the formatting you applied:

See also this tip in French: Comment changer la police et le style par défaut des formes dans PowerPoint.