When you use 
FILTER on the Search menu, you can change the column set items that are displayed as the default search
filters to control the set of search results that are returned for each API Entry
Point.
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In the Desktop Client, locate the API Entry Point, and click Show Column Set > Manage Column Items.
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In the Web Search Default column item, set each attribute to True that you want to use as a default filter for that entry point. Any search then includes the attributes in the Search menu criteria by default.
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Click Administration > API Services > Regenerate Metadata to refresh the metadata.
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Only string based properties can be used as the filter defaults, such as Classification or Category.
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If no column set attributes are set as the search filters, Name is used by the Search menu by default.
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If there is just one column set attribute set, it is automatically selected in the Search menu as the default.