To zoom IN on all contents of the window you're working in, click the Window Zoom In option under the View menu at the top of the window
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OR
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Press Alt+= on your keyboard for PCs or Option+= for Macs.
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To zoom OUT on all contents of the window you're working in, click the Window Zoom Out option under the View menu at the top of the window
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OR
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Press Alt+- on your keyboard for PCs or Option+- for Macs.
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To return to the default size for all contents of the window you're working in, click the Reset to Default Window Zoom option under the View menu at the top of the window
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OR
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Press Alt+0 on your keyboard for PCs or Option+0 for Macs.
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​Note that the page contents in the main drafting window and the drawing canvas in the Drawing Tool can be zoomed independently from their windows.