PowerPoint 2011 now sports the Ribbon interface but it still continues having menus and toolbars. Among the most important of the toolbars is the Standard Toolbar that is located beneath the menu bar. If you can’t find the Standard Toolbar within the PowerPoint 2011 interface, select the View | Toolbars | Standard menu option to make it visible. Conversely, deselecting the same menu option will hide the Standard Toolbar.
Learn about the Standard Toolbar in PowerPoint 2011 for Mac.

