The Quick Filter allows you to filter Items in your Catalog. Quick Filters are also common throughout SI on many forms for filtering your data.
What you can filter by depends on what interface you are in within SI. Use the buttons along the left side to choose your filter(s).
When a filter is applied, the Show Filter button becomes active. Clicking this will display a summary of the applied filters:
To clear a filter you can click the Clear button when viewing the filter:
You can also use the Reset button on the ribbon: