Problem:
The customer needed to filter posts in her directory by a custom taxonomy called Features, ensuring that only posts with all selected tags were displayed (using an AND operator instead of OR).

Solution:
We determined that Toolset Blocks does not natively support changing the operator from OR to AND for multiple select fields. As a workaround, we enabled legacy views and configured the custom search to use the AND operator. Additionally, we used custom code with the wpv_filter_query filter to change the operator to AND. The specific code was added to the theme's functions.php file, targeting the correct view_id:

add_filter('wpv_filter_query', 'custom_taxonomy_query_operator', 10, 3);
function custom_taxonomy_query_operator($query_args, $view_settings, $view_id) {
    if ($view_id == 509) { 
        if (isset($query_args['tax_query'])) {
            foreach ($query_args['tax_query'] as &$tax_query) {
                if (isset($tax_query['operator']) && $tax_query['operator'] == 'IN') {
                    $tax_query['operator'] = 'AND';
                }
            }
        }
    }
    return $query_args;
}