Detailed Drawings > Defining the Drawing Layout > Working with Model Views > Customizing Drawing Views > Determining Visible Area of Views > Extending the Symmetry Line of a Half View
  
Extending the Symmetry Line of a Half View
When you insert a half view, the symmetry line of the half view is not extended to the view outline under the following conditions:
The display style is nonshaded, such as Wireframe, Hidden, or No Hidden.
The symmetry line standard is Symmetry line, Symmetry line ISO, or Symmetry line ASME.
To extend the symmetry line to the view outline, right-click the view and click Extend Symmetry Line.
The following images show a half view before and after extending the symmetry line to the view outline: