You want to disable reflections in drawing shaded views for screen printing drawings etc.
Run REGEDIT from the CMD prompt, and create a key as below:-
[HKEY_CURRENT_USER\Software\Autodesk\Inventor\RegistryVersion16.0\Applets\DrawingLayout\Preferences\]
Create a key with this value:
"Suppress Specular Color"=dword:00000001
If the key is not present or its value is zero or less, then reflections are enabled under drawings (Default behavior).
Remember to re-start Inventor for this change to take place.
