Note: If you apply a slide layout to one or more slides in your presentation, and then go back and edit that layout by adding a placeholder or custom prompt text, you must reapply the layout to the slides so that the slides adhere to the updated layout.
For more information about layouts, see Overview of slide layouts.
On the View tab, in the Presentation Views group, click Normal.
In Normal view, in the pane that contains the Outline and Slide tabs, click the Slides tab.
Click the slide that you want to apply a layout to.
On the Home tab, in the Slides group, click Layout, and then select the layout that you want.