odoo16/addons/l10n_ch/views/account_invoice.xml

<?xml version="1.0"?>
<odoo>
    <template id="l10n_ch_report_invoice_document" inherit_id="account.report_invoice_document">
        <xpath expr="//div[@id='qrcode']" position="attributes">
            <attribute name="t-if" add="and o.qr_code_method != 'ch_qr'" separator=" "/>
        </xpath>
    </template>
</odoo>