related products woocommerce

Dear support,
the 4 related products don´t show-up in on row. They split in 2 rows. How can i avoid that?

I used that code in the function.php:

function avia_chance_wc_related_columns(){
global $avia_config;
$avia_config[‘shop_single_column’] = 4; // columns for related products and upsells
$avia_config[‘shop_single_column_items’] = 4; // number of items for related products and upsells
}
add_action(‘wp_head’, ‘avia_chance_wc_related_columns’, 10);