In the product details in the Stock tab you can see the total, reserved and available stock (Overview section) as well as the distribution of the stock to the individual warehouses and bin locations . You can also make manual stock changes, track stock movements and specify the quantity from which the product should be proposed for reordering (Reorder Point).
The reserved stock consists of all orders with the order status Open or In Process and the delivery status Open or Partially Dispatched. Within these orders, only those items that have not yet been dispatched or have only been partially dispatched are taken into account. If you click the field Reserved stock, the Orders tab opens with the corresponding filters so that you can see all relevant orders. You can find more information about the Orders tab here.