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On the Design tab, selectÂ
 ​​​​​​​Slide Size and choose Custom Slide Size. -
Under Slides sized for, select the page size to use.Â
Tip:Â For more info on size, see Change the size of your slides.Â
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On the Design tab, selectÂ
 ​​​​​​​Slide Size and choose Page Setup. -
Under Slides sized for, select the page size to use.Â
Tip:Â For more info on size, see Change the size of your slides.Â
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On the Design tab, selectÂ
 Slide Size and choose  ​​​​​​​Custom Slide Size. -
Under Slide size for, select the page size to use.
Tip: See these detailed steps for info about specific page sizes.