I have noticed that the categories now have a Visible Y/N radio button immediately to the right of each category. I have chosen No for one of my categories. I am still seeing this category on my results pages. Do I need to run a new walk for this to take effect? I am assuming that if I choose No for a category it will be available threw the forms in my web site html pages but not visible in the search results category drop down. Is this correct?
Correct. You can still search by the categories that are not visible.
Make sure you check Y for the remaining categories and that you selected the correct one. The vertical alignment of the buttons isn't always perfect with respect to the categories.