pos/pos_customer_required/demo/pos_config.xml

<?xml version="1.0"?>
<!--
    Copyright (C) 2016-Today: La Louve (<http://www.lalouve.net/>)
    Copyright (C) 2019-Today: Druidoo (<https://www.druidoo.io>)
    @author: Sylvain LE GAL (https://twitter.com/legalsylvain)
    License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
-->

<odoo>
    <!-- POS Config: Require Customer(Required before starting the order) -->
    <record id="point_of_sale.pos_config_main" model="pos.config">
        <field name="require_customer">order</field>
    </record>
</odoo>