- In the Theme task pane, right-click the thumbnail for the theme you want to edit, and then click Edit.
Note If you don’t see the Theme task pane, on the Format menu, click Theme.
- In the Edit Theme Colors or Edit Theme Effects dialog box, choose the options you want, and click OK.
Note You can’t edit the built-in themes that are included with Visio. If you want to make a change to one of the built-in themes, duplicate it and then edit the duplicate theme.