Remove Total Weight column from free version

I used the following code snippet found in a previous thread but it does not remove the “Total Weight” column from the Packing List page. Is there another way to do this?

add_filter(‘wf_pklist_alter_product_table_head’, ‘wt_pklist_hide_weight_column’, 10, 3);
function wt_pklist_hide_weight_column($columns_list_arr, $template_type, $order)
{
if($template_type==’packinglist’)
{
if(isset($columns_list_arr[‘total_weight’]))
{
/* removing weight column */
unset($columns_list_arr[‘total_weight’]);
}
}
return $columns_list_arr;