Sales Order line One2Many Filter Widget Odoo App helps users to use one2many filter which is name as 'Product' under sale order line. When the user adds an order line and saves a sale order then the filter will show up. When the user can remove products from the filter those products will be invisible from the sales order line but if you save it, all products will be shown as it is.

One2Many Filter in Sale Order Lines

Under sale order lines you can see one2many filter name as 'Product', When you add order lines and save it then the filter will show up.

When you remove products from one2many filter those products will invisible from sale order line but you save it, all products will shown as it is.