I don't have access to all the preference menus listed in the help page. I tried to look online as to why, but found nothing with a search.
From here:
My options:
Directory Opus Light 12.32 Build 8588 x64
OS 10.0 (B:19044 P:2 T:1) SP 0.0
If you're using Opus Light, that would be why. The manual is written for Opus Pro.