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On the Design tab, select
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Select the Slides sized for drop-down and choose a preset option, or manually set Width or Height, and Portrait or Landscape, and then select OK.
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If asked, select Maximize to use all available space or select Ensure Fit to scale down content to fit the new layout.
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On the File menu, select Page Setup.
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In the Page Setup dialog box, under Slides sized for, select a preset size, or choose Custom and set the dimensions.Â
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Select OK.
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On the Design tab, select Slide Size and choose Custom Slide Size.
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Select the Slides sized for drop-down and choose a preset option, or manually set Width or Height, and Portrait or Landscape.
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Select OK.
