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, custom prompt text, or completing some other layout-altering action, you must reapply the layout to the slides so that the slides adhere to the updated layout.
Change an existing layout
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On the View tab, click Slide Master.
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In the thumbnail pane that contains the slide masters and layouts, pick the layout that has closest arrangement of placeholders to how you want your slide to look.
Note: The slide master is always the top thumbnail, and the other slide layouts are beneath it.
Tip: If you don't like any of the layouts, pick the Blank Layout and start over by adding placeholders to contain text, pictures, videos, etc.
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To change an existing layout, do one or more of the following:
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To add a placeholder, on the Slide Master tab, click Insert Placeholder, and then select a placeholder type from the list. Click a location on the layout, and then drag to draw the placeholder.
 
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To rename the layout, in the thumbnail list of layouts, right-click the layout that you customized, and then click Rename Layout.
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In the Rename Layout dialog box, type a new name that describes the layout you’ve just created, and then click Rename.
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On the Slide Master tab, click Close Master View.
 
Apply the updates so that they appear on your slides
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In Normal View, in the thumbnail pane, click the slide that you want to reapply the updated layout to.
Note: To select multiple slides, press and hold the Ctrl key, and then click each slide.
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On the Home tab, in the Slides group, click Layout, and then select the layout that you updated in Slide Master View.