You can change the representation of lines and outlines to meet your requirements.
Procedure
Double-click a graphic symbol.
Make your selection in the Line style box.
Use the slider to select the line weight.
Click Preview to view your changes.
Click OK to apply your changes.
The line style and line weight are displayed in accordance with your settings.
Tip
If you enable the Freeze line check box, the line style you specified for use with the graphic symbol in models cannot be changed.