The item lookup on the sales order lines ("All sales orders" form) allows for searching on the search name as well whenever you start typing in the "Item number" field. Based on the entered characters, it automatically resolves if the lookup should be filtere on the item number or on the search name.

On the return order lines ("All return orders" form) however, it does not allow to do that. It only filters the lookup on the item number column.

The idea would be to streamline the item lookup on both forms, since from a business perspective the item lookup should behave in the same way, allowing to filter on search name easily in both forms by just typing in the "Item number" field of the order lines...