This help file applies on versions starting with 4.20

To select a certain term for a single term dropdown  for advanced search you need to edit
libs\elementor_help_files2.php and at line 128 add a code similar with this


if($search_field =='categories'){
$value='your value';
}


The taxonomy name can be found as the key for the $field_options array in the same function. Possilbe values are : ‘categories’, ‘types’,’cities’, ‘areas’, ‘county / state’ and ‘property status’