When your diagram contains real-world objects that are larger than the printed page, set-up the drawing scale to reflect the actual size.
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Go to the page that you want to change the drawing scale on, and select Design.
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In the Page Setup group, select the More arrow.
Tip: Each page in a drawing can have a different drawing scale.
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Select Drawing Scale.
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Select Pre-defined scale, and choose the pre-defined scale you want.
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Select a scale ratio if you'd like, or select Custom Scale and enter your own values.
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Select OK.
Source: Microsoft