This option will affect the work of the Products Search controls added to your annasta presets. Select one of the supported 3d party search engines, or leave the WooCommerce default engine to be used when combining the filtered results with keyword search.
Currently supported 3d party search engines:
For the 3d party engine to work it has to be installed and activated in the Plugins section of your WordPress admin. String search will default to the built-in WooCommerce search whenever the selected 3d party engine is not found.