Making Changes to a Slide Master
Within the Slide Master view, you can work with font formats and bullet list styles, insert text or text boxes, add graphics, or rearrange elements of any slide layout. You make these changes much as you do in the Normal view of PowerPoint. However, any changes you make in the Master view will be reflected on every slide to which the changed layout is applied. If you want to apply changes to all slides except the Slide Title layout, make those changes to the Master Layout at the top of the layout thumbnails.
Display and Navigate Masters
Click the View tab and choose Slide Master from the Presentation Views group. ...
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