Display the quantity field for non-existent products

Hi,

I don't read arabic but I suppose that the yellow button on your screenshot is the "add to wishlist" button. Since you can add several items of the same product in the wishlist, the quantity input field needs to be displayed if the add to wishlist button is displayed.
A product can be added to the wishlist even without any stock.

Hi,

Well, if you don't want users to be able to add more than 1 item of a product to their wishlist when the product doesn't have any stock left, you would need to do some view overrides via the menu Display>Views.
For the products listing, you can edit the view file add_to_cart_ajax.php
There, add the line:

if(!$add_to_cart) { $this->quantityLayout = 'show_simple'; }

if($display_quantity_field && (!$global_on_listing || !$has_required_fields )) {

if(($add_to_cart || $add_to_wishlist) && $display_quantity_field) {