The search filter on your site shows only the amenities you have selected under HomeRunner > Explorer settings, in the order they are listed there.
Curating the list. Remove any amenities you do not want, then reorder the remaining ones. The first N amenities, where N is the primary features number on that same settings page, appear at the top of the filter panel. The rest are hidden behind an expand control.
Why an amenity is missing. An amenity can only be offered as a filter if at least one listing carries it in your PMS. If an amenity you want is missing from the filter options, add it to the relevant listings in your PMS. It appears after the next sync.
Amenity names. The filter uses your PMS’s own amenity label. For example, if your PMS lists the amenity as "Sea view" rather than "Ocean view", guests see "Sea view" in the filter.