Upsells in a tab

Hi, i’ve added an upsells tabs to my product page using the code found here:
https://www.ads-software.com/support/topic/up-sells-in-a-tab?replies=9
and it works perfectly apart from 1 small issue, the output displays in 2 columns.

I’ve been trying to change the layout using this snippet, but it doesn’t work.

if ( ! function_exists( 'woocommerce_output_upsells' ) ) {
	function woocommerce_output_upsells() {
	    woocommerce_upsell_display( 10,5 ); // Display 10 products in rows of 5
	}
}

If anyone knows where i’m going wrong, please share.

Best regards
Darrell

This the full code taken from the thread mentioned above.

// Remove the WooCommerce Upsell hook
remove_action( 'woocommerce_after_single_product_summary', 'woocommerce_upsell_display', 15 );

// Add a custom action to display Upsells
add_action( 'growdev_after_single_product_summary', 'woocommerce_upsell_display', 15 );

if ( ! function_exists( 'woocommerce_output_upsells' ) ) {
	function woocommerce_output_upsells() {
	    woocommerce_upsell_display( 10,5 ); // Display 10 products in rows of 5
	}
}

// A filter to add a custom tab
add_filter('woocommerce_product_tabs','growdev_add_tab');

// Callback for add_filter that defines the filter. You can change 'New tab' to the desired
// tab title
// growdev_custom_tab is the function callback
function growdev_add_tab( $tabs ) {
	$tabs['upsell_tab'] = array( 'title' => 'Colours', 'priority' => 29,
								 'callback' => 'growdev_custom_tab');
	return $tabs;
}

// The function callback for the custom tab.
// This does the display upsells action inside of the tab
function growdev_custom_tab( $key, $tab ) {

	do_action('growdev_after_single_product_summary');

}

https://www.ads-software.com/plugins/woocommerce/