After issuing a query, the search results list includes a set of controls on the right side of the window that allow you to refine the search results list according to a set of pre-defined filters. For example, if you are only interested in open access articles, you can click “Open Access” from the Categories group and “Articles” from the Document Type group. You may notice that there is a number after each of these items; this specifies how many of the search results match each criterion. As you make selection, an Apply Filter button appears at the bottom of the screen, which includes an estimate of how many search results will match your query with these filters activated. If you would like to see these search results, clicking on the button will reload the search results that match the query and the filters you have selected.
Removing any of the filters you have added will broaden the set of search results. This can be done by clicking on the garbage icon beside the filter name under “Active Filters”. To view the updated search results, the Apply Filter button will need to be clicked again.
Each time a set of filters is applied, this is treated as a new query and is added to the list of queries in the task view. These are highlighted as being different than the original query by the addition of a filter icon and the number of filters applied. The application of filters is also apparent by the smaller number of matching search results.