If you have a large, detailed diagram that you want to show to an audience, Visio helps you do that with features that emphasize details in an easily readable size:
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You can zoom in or out of a drawing
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You can pan from one area to another quickly and smoothly
Visio lets you pan and zoom with either keyboard shortcuts or friendly on-screen tools. Watch this 80-second demonstration:
Try It With your diagram open in Visio, select View > Task Panes > Pan & Zoom to get started.
Tip: To make more room for your drawing on the screen while presenting, press Ctrl+F1 to collapse the toolbar ribbon.
Another option: Present a series of pages as a "slide show"
Presentation mode 
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You can browse the pages of your diagram one at a time, much like a slide show.
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A right-click menu also allows you to easily jump to a specific page.
Presentation Mode has very limited zoom-in capabilities, so it's only suitable if your audience can see the drawing's details at the size presented.
Try It With your diagram open in Visio, select F5 to switch to presentation mode. Press the Right Arrow or Left Arrow key to move forward or backward through the pages of the drawing.
