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Open a slide.
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On the Design tab, point at a thumbnail image in the Themes gallery to get a preview.
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To see the full gallery of themes, select more
 ​​​​​​​Themes: -
Select a thumbnail image to apply the theme to all slides in your presentation.
For more info, see Apply themes to presentations in PowerPoint.
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Open a slide.
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On the Design tab, point at the theme gallery and select the
 down arrow to see all the choices. -
Select a theme to apply it to all slides in your presentation.
For more info, see Apply themes to presentations in PowerPoint.
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Open a slide.
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On the Design tab, select
 More Themes and select one to use. -
Select
 ​​​​​​​More Variants to open variations on the theme.​​​​​​​
For more info, see Apply themes to presentations in PowerPoint.