One of the advantages of using the Navigator palette (found under the Window menu) is that no matter how big your document is, you'll always see a thumbnail view in the Navigator. The red box indicates the portion of the document you are currently viewing in your window. To take full advantage of this thumbnail view and zoom in to a specific location in the document, hold down the Command key (PC: Control key) and click-and-drag in the Navigator thumbnail view. To return to a smaller view, Command-click (PC: Control-click) on the thumbnail again.
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