manufacture/mrp_workcenter_hierarchical/wizards/res_config_settings_views.xml

<?xml version="1.0" encoding="utf-8" ?>
<odoo>
        <record id="res_config_settings_view_form" model="ir.ui.view">
            <field name="model">res.config.settings</field>
            <field name="inherit_id" ref="mrp.res_config_settings_view_form" />
            <field name="arch" type="xml">
                <xpath
                expr="//div[@id='workorder_settings_dependencies']"
                position="after"
            >
                    <div
                    id="workcenter_hierarchy"
                    class="row mt-2"
                    attrs="{'invisible': [('group_mrp_routings','=',False)]}"
                >
                        <field
                        name="workcenter_parent_level_empty"
                        class="col flex-grow-0 ml16 mr0 pe-2"
                    />
                        <div class="col ps-0">
                            <label for="workcenter_parent_level_empty" />
                            <div class="text-muted">
                                The parent level on workcenters will be empty if case of  there are no parent/great parent or more.
                                On the contrary, by default, the parent level are always set, allowing a view by workorder grouped by top parent workcenter
                            </div>
                        </div>
                    </div>
                </xpath>
            </field>
        </record>
</odoo>