Applies To
PowerPoint for Microsoft 365 PowerPoint for Microsoft 365 for Mac PowerPoint for the web
  1. On the Design tab, select Slide Size and choose Custom Slide Size. 

  2. Choose Landscape or Portrait and select OK. You can't mix landscape and portrait slides in one presentation.

  3. Choose Maximize if prompted, to allow content to use all available space or Ensure Fit to make content fit into the page.

Tip: For a single-orientation workaround, see Use portrait and landscape slides in the same presentation?,​​​​​​​

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