Every new PowerPoint presentation comes with a number of predefined layouts (under Home > Layout) that let you quickly change a slide's appearance based on the type of content you want to display. You can also customize the placeholders and other objects in a layout, and then save your changes as a new theme.
Pick a standard slide layout
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In Normal view, on the Home tab, click Layout.
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Pick a layout that best suits the content of your slide.
Customize a slide layout
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On the View tab, click Slide Master.
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The slide layouts appear as thumbnails in the left pane below the slide master.
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Do one or both of the following:
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Click the layout you want and customize it. You can add, remove, or resize placeholders, and you can use the Home tab to make changes to fonts, colors, and other design elements.
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Click Insert Layout to add a new slide and format it.
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Click Close Master to stop editing layouts.
Your revised slide layout will be available to insert as a new slide anywhere in your presentation.
Save your changes as a new theme
To save your changes:
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Click Design and point to any theme.
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Click the down arrow under that appears under the themes panel.
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Click Save Current Theme, give the theme a name, and click Save. Your new theme will contain your newly revised slide layout and will be available in Themes gallery.
Related information
Slide masters in PowerPoint 2016 for Mac
Using themes in PowerPoint 2016 for Mac