Sorry, but it would appear there is no optioin we have that governs this.
About the best you can do is to disable the "Show Context in Search Result". But that doesn't remove the ranking.
You may wish to suggest it as an option.
Yes, I definitely would like to suggest it as an option in the next release!!! How do I do that?
Thanks for your help.
By clicking the big ole link I carefully placed in the post!
It's been over a year since your post here, but in the event that you might still want to know about a work-around for at least hiding the Rank column until such time that some of our requested options may be added to the Search results in RoboHelp, here's a link to the thread that contains the information. Bonne chance! http://forums.adobe.com/message/2898507#2898507