Add pages to your diagram files to keep related diagrams together, link pages together, or present a series of diagrams to your team.
Add a new page
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Select Insert Page next to the page tabs.
or
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Select Insert > New Page > Blank Page or Duplicate This Page.
Rename a page
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Right-click the page tab, and select Rename.
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Type in a new name for the page, and press Enter.
Reorder pages
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Drag the page tab to a different location.
Delete a page
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Right-click the page tab, and press Delete.
Source: Microsoft