Line Width...

  The Line Width...  menu item allows you to change the shape
  of the current line.

  Lines drawn with the shape tools can be thick or thin.  To
  change the current line width:

  1.  Choose Line Width...  from the Options menu.

      The Line Width dialog box appears.

  2.  Click on the line thickness you want.

  3.  Click on OK.

  Additional topics:

  *   Options Menu

  *   Using Menus and Controls

  *   Overview of Paint