Change the order of pdf cat taxonomy to DESC instead of ASC

change-taxonomy-order.php

function tncsupport_pre_get_terms_order( $query ) {
    if ( is_admin() && ! wp_doing_ajax() ) {
        return;
    }

    if ( isset( $query->query_vars['orderby'] ) && $query->query_vars['orderby'] === 'name' ) {
        $query->query_vars['order'] = 'DESC';
    }
}
add_action( 'pre_get_terms', 'tncsupport_pre_get_terms_order' );