Limit supplemental search engine search queries to 7 terms, but not the default search engine search queries

gistfile1.php

<?php

function my_searchwp_max_search_terms_supplemental( $maxTerms, $engine ) {
  // limit to 7 search terms for all supplemental search engines, not the default
  return 7;
}

add_filter( 'searchwp_max_search_terms_supplemental', 'my_searchwp_max_search_terms_supplemental', 10, 2 );