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To zoom in, place two fingers on the sketch canvas and spread them apart.
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To zoom out, place two fingers on the sketch canvas and pinch them together to zoom out.
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To pan the sketch, simply touch the sketch canvas with two fingers and drag your fingers in the direction you need to pan.
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Tap the fit key on your sketch keyboard, or, double‑tap a blank area of the sketch canvas with one finger to fit the sketch and center it on the screen.