pos/pos_customer_required/views/pos_config_view.xml

<?xml version="1.0"?>
<!--
    Copyright (C) 2004-Today Apertoso NV (<http://www.apertoso.be>)
    Copyright (C) 2016-Today La Louve (<http://www.lalouve.net/>)

    @author: Jos DE GRAEVE (<Jos.DeGraeve@apertoso.be>)
    @author: Sylvain LE GAL (https://twitter.com/legalsylvain)

    The licence is in the file __manifest__.py
-->

<odoo>

    <record model="ir.ui.view" id="view_pos_config_form">
        <field name="name">view.pos.config.form</field>
        <field name="model">pos.config</field>
        <field name="inherit_id" ref="point_of_sale.pos_config_view_form"/>
        <field name="arch" type="xml">
            <div id="product_prices" position="after">
                <div class="col-xs-12 col-lg-6 o_setting_box" id="require_customer">
                    <div class="o_setting_right_pane">
                        <label for="require_customer" string="Require Customer"/>
                        <div class="text-muted">
                            Require Customer
                        </div>
                        <div class="content-group">
                            <div class="mt16">
                                <field name="require_customer" class="o_light_label" widget="radio"/>
                            </div>
                        </div>
                    </div>
                </div>
            </div>
        </field>
    </record>

</odoo>