Tools tab > View group > 
Zoom menu, ZOOM
Note: You can use the wheel of a mouse to zoom and pan. Zoom in and out of the drawing by turning the wheel. Pan the drawing by pressing the wheel down and moving the mouse.
With these functions, you can set the displayed portion of the drawing.
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Zoom extents – Zoom to the extents of the objects in the drawing. This mode does not change the drawing limits but zooms to display all objects, even those that are outside the drawing limits.
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Zoom window – Define the area by indicating two corner points.
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Zoom limits – he program zooms to the drawing limits. See Set the drawing area limits.
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Zoom previous – Go back to the previous view.
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Zoom back – Reverse the last Previous zoom.
If the sides of the area that you selected have a different ratio than the drawing area, the longer side determines the area of the zoom view. For this reason, the zoomed area might be bigger than what you indicated.