public/access_settings_menu/security/access_settings_menu_security_demo.xml

<?xml version="1.0" encoding="utf-8" ?>
<!-- Copyright 2018 Ivan Yelizariev <https://it-projects.info/team/yelizariev>
     License MIT (https://opensource.org/licenses/MIT). -->
<odoo>
    <!-- Grant access to Demo User to don't break CI of other modules -->
    <record id="group_show_settings_menu" model="res.groups">
        <field name="user_ids" eval="[(4, ref('base.user_demo'))]" />
    </record>
</odoo>