odoo-pos-distribution/odoo/addons/ip_pos_ticket_order_number/static/src/xml/pos.xml

<?xml version="1.0" encoding="UTF-8"?>
<templates id="template" xml:space="preserve">

  <!-- Printed -->
  <t t-extend="XmlReceipt">
    <t t-jquery="[t-esc='receipt.name']" t-operation="before">
      <div bold="on" size="double-height" t-if="big_number">
        <t t-esc="order_number"/>
      </div>
    </t>
  </t>

  <!-- Displayed in browser -->
  <t t-extend="PosTicket">
    <t t-jquery="t[t-if='receipt.footer']" t-operation="after">
      <div style="text-align: center; font-size: 80px;" t-if="big_number">
        <b><t t-esc="order_number"/></b>
      </div>
    </t>
  </t>

  <t t-extend="OrderChangeReceipt">
    <t t-jquery="t[t-if='changes.new.length > 0']" t-operation="after">
      <div bold="on" size="double-height">
        <t t-esc="changes.order_number"/>
      </div>
    </t>
  </t>

</templates>