functions.php

function search_filter($query) {
    if(!is_admin()) {
        if($query->is_main_query() || is_archive()) {
              $query->set('post_type', 'post');
              $query->set('cat', '-1307,-1');
            }
        }
    }
    return $query;
}
add_action('pre_get_posts', 'search_filter');