On the left side of the catalogue, underneath the categories, you find the filters. The filters differ in all catalogues, and not every catalogue contains filters.
The filters can be used to restrict a search. To use them, click on one or more filters.
|The selected filters are then displayed above the search results.
To remove a filter, you can either click on the "x" to the right of the filter (in the displayed filters above the search results). Alternatively, remove the tick in the filter on the left side of the catalogue.