How to searching in Hikashop admin

-- HikaShop version -- : 2.21
-- Joomla version -- : 3.15
-- PHP version -- : 5.31
-- Browser(s) name and version -- : Firefox 24
-- Error-message(debug-mod must be tuned on) -- : Error_message

Isn't product searching in the admin area should be simple. I typed a word without changing any of the drop down box. but there's no result. Why so.

Whats the best way to search products in Hikashop admin area?

The searching of the products only search in the current category. If you want to search throughout all the categories, go in the main category and change the filter from "direct sub elements" to "all sub elements" and it will display all the matching products regardless of the current category.

Is there a way to make "All sub elements" the default when searching for products on the admin side?
Thank you!

Change the line:
$selectedType = $app->getUserStateFromRequest( $this->paramBase.".filter_type",'filter_type',$config->get('sub_products_display_all',0),'int');
to:
$selectedType = $app->getUserStateFromRequest( $this->paramBase.".filter_type",'filter_type',$config->get('sub_products_display_all',1),'int');
in the file administrator/components/com_hikashop/views/products/view.html.php