pos/pos_place/views/view_pos_order.xml

<?xml version="1.0" encoding="UTF-8"?>
<!--
Copyright (C) 2013 - Today: GRAP (http://www.grap.coop)
@author: Sylvain LE GAL (https://twitter.com/legalsylvain)
License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
-->
<odoo>

    <record id="view_pos_order_tree" model="ir.ui.view">
        <field name="model">pos.order</field>
        <field name="inherit_id" ref="point_of_sale.view_pos_order_tree" />
        <field name="arch" type="xml">
            <field name="partner_id" position="after">
                <field name="place_id" groups="pos_place.group_pos_place_user"/>
            </field>
        </field>
    </record>

    <record id="view_pos_order_form" model="ir.ui.view">
        <field name="model">pos.order</field>
        <field name="inherit_id" ref="point_of_sale.view_pos_pos_form" />
        <field name="arch" type="xml">
            <field name="partner_id" position="after">
                <field name="place_id" groups="pos_place.group_pos_place_user"/>
            </field>
        </field>
    </record>

</odoo>