Hello Aprilia Zahratunnisa,

This field is part of the "sale stock" module and is associated with the view ID "view_order_form_inherit_sale_stock_qty." The specific widget used is called <widget name="qty_at_date_widget" width="20px"/>.

This widget is designed to provide users with a clear representation of stock quantities , which can be particularly useful for inventory management and sales forecasting.

I Hope this information proves helpful to you.

Thanks & Regards,

Email:   odoo@aktivsoftware.com

Skype: kalpeshmaheshwari