In Odoo 17, the XML files for the POS (Point of Sale) interface are usually located within the point_of_sale module. The specific file you're looking for, which contains the numpad and the % Disc button, is likely in the views directory of the module.

Here's a general path where you might find it:

plaintextCopy codeodoo/addons/point_of_sale/views/pos_templates.xml

In this file, you should be able to locate the template related to the numpad, which includes the buttons. The button for % Disc is typically identified by a specific class or ID that you can use to hide it using custom XML or JavaScript.

If you're unable to locate the exact class for the button in the XML file, you can also inspect the element directly in your browser's developer tools while the POS is running. This will give you the class or ID that you can target in your custom code.