You can also try changing the layout by opening the layout gallery to the left of Change Colors. Click the style or color you want to select it. Select the SmartArt tab of the Ribbon, and then select either Change Colors or Styles to see a menu of available options for the timeline graphic. You can also choose a different graphic layout entirely. You can change the color or style of the timeline graphic.
Optionally, you can make a sub-item in the bulleted list by clicking the bullet with the text you want to use for a sub-item, and on the Smart Art tab, clicking Demote. In the text editor, enter the dates and descriptions, and then press Enter.
On the slide, a text editor opens next to the graphic so you can easily add words to the graphic.
Pick a timeline layout from the gallery that appears, such as this Basic Timeline in the List section.
