Modifying WordPress Loop for Custom Tax

functions.php

<?php

add_action( 'pre_get_posts', 'stepasyuk_custom_wp_query' );
function stepasyuk_custom_wp_query( $wp_query ){
    if( $wp_query->is_main_query() && $wp_query->is_tax('categories-formations') ){
        $wp_query->set('posts_per_page', -1);
        $wp_query->set('orderby', 'date');
        $wp_query->set('order', 'DESC');
    }
}

?>