How to Change the SmartArt Style in PowerPoint 2013
Click the Design tab.
Microsoft provides a large assortment of SmartArt styles to choose from.
Note that the SmartArt Tools Design tab also includes controls that let you modify the SmartArt diagram by adding additional shapes or bullet items or changing the chart type. You can also reset the diagram to its original appearance by clicking the Reset Graphic button found in the Reset group.