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Right-click an AutoCAD drawing that you have added to Visio, point to CAD Drawing Object, and then click Properties.
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Click the Layer tab.
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To change a layer's line color, select the layer, click Set Color, and then select a new color from the Colors dialog box. Click OK.
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To change a layer's line weight (thickness), select the layer, click Set Line Weight, and then type a line weight in the Custom Lineweight dialog box. Click OK.
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Change the line color or line weight of a CAD layer in Visio