Adjustment of thickness property does not change width of ...
Although you changed the Thickness property for lines, the width of displayed lines does not change in AutoCAD. "Thickness" refers to the depth of an object, not the width of the line. This property can be used to give the appearance of 3D thickness to 2D drawings. In AutoCAD, the thickness of an object refers to the distance that the object is extended above or below its location in 3D
