Once the file is loaded, right-click on any slide’s background, and choose Format Background from the context menu. Launch PowerPoint, and open the presentation you want to edit from the Backstage view.Ģ. If you want all of your slides to have the same background, the following tutorial will help you accomplish this in just a few clicks, saving you a lot of editing time.ġ. Editing PowerPoint slides to make them look uniform can take a lot of time, especially for a large presentation.