FileLocator Pro v7 or higher
To search for ONLY folders select the 'Folders Only' option from the File name preset list and then specify the name of the folder in the File Name field, e.g.:

FileLocator Pro v6.5 or lower
The 'File name' field should match against any file or folder name. Here's an example of searching for the word 'system':

As you say you can restrict the list to just Folders by setting the 'Folder' attribute to 'On' in the Attributes tab:

If you're experiencing different results then try performing a quick 'clean' search just to make sure FileLocator Pro is working properly:
- Click the menu option File->New Blank Search
- Enter a simple search term for ONLY the File name field, e.g. system
- Run the search
If you still find that FileLocator Pro is not finding folders please post a screen shot or contact technical support with more information.