pos/pos_customer_display/views/view_pos_config.xml

<?xml version="1.0"?>
<odoo>

    <record id="view_pos_config_form" model="ir.ui.view">
        <field name="model">pos.config</field>
        <field name="inherit_id" ref="point_of_sale.pos_config_view_form"/>
        <field name="arch" type="xml">
            <xpath expr="//field[@name='iface_cashdrawer']/.." position="after">
                <div class="row">
                    <label string="LED Customer Display" for="iface_customer_display" class="col-lg-3 o_light_label"/>
                    <field name="iface_customer_display"/>
                </div>

                <div class="row" attrs="{'invisible': [('iface_customer_display', '=', False)]}">
                    <label string="Line Length" for="customer_display_line_length" class="col-lg-3 o_light_label"/>
                    <field name="customer_display_line_length"/>
                </div>

                <div class="row" attrs="{'invisible': [('iface_customer_display', '=', False)]}">
                    <label string="Next Customer (Line 1)" for="customer_display_msg_next_l1" class="col-lg-3 o_light_label"/>
                    <field name="customer_display_msg_next_l1"/>
                </div>
                <div class="row" attrs="{'invisible': [('iface_customer_display', '=', False)]}">
                    <label string="Next Customer (Line 2)" for="customer_display_msg_next_l2" class="col-lg-3 o_light_label"/>
                    <field name="customer_display_msg_next_l2"/>
                </div>

                <div class="row" attrs="{'invisible': [('iface_customer_display', '=', False)]}">
                    <label string="PoS Closed (Line 1)" for="customer_display_msg_closed_l1" class="col-lg-3 o_light_label"/>
                    <field name="customer_display_msg_closed_l1"/>
                </div>
                <div class="row" attrs="{'invisible': [('iface_customer_display', '=', False)]}">
                    <label string="Pos Closed (Line 2)" for="customer_display_msg_closed_l2" class="col-lg-3 o_light_label"/>
                    <field name="customer_display_msg_closed_l2"/>
                </div>

            </xpath>
        </field>
    </record>

</odoo>