Refine Your Results
Using the Refine your results button you can refine your results by filtering on fields that have content. On the Results Options screen the 'Show refine results' option must be enabled (the default setting is "enabled"). The button shows a list of the fields with content (metadata or a value). Selecting a field or fields filters the results list on those fields. You can filter down to a single document.
Only fields that have the option 'Use for visualization' selected will be displayed in the Refine your results section. For more information, see the ZyINDEX manual > Field Definition Option: Use for Visualization.