Clicking and dragging to select an area creates a free-form shape, instead of a rectangle. You want to know how to disable the lasso selection feature in AutoCAD and AutoCAD LT.
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For Windows versions of AutoCAD/AutoCAD LT, type OP or OPTIONS to bring up the Options dialog.
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In the Options, go to the Selection tab and uncheck the lasso feature, shown in the screenshot below.
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For Mac versions of AutoCAD and AutoCAD LT, type the variable name PICKAUTO at the Command line. Enter a new value of 1. (There are other possible values, but 1 will be the most commonly used, if lasso selection is not desired.)
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