social/mail_force_queue/views/res_config_view.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>
    <record id="view_general_configuration_mail_force_queue" model="ir.ui.view">
        <field name="name">view_general_configuration_mail_force_queue</field>
        <field name="model">base.config.settings</field>
        <field name="inherit_id" ref="base_setup.view_general_configuration"/>
        <field name="arch" type="xml">
            <xpath expr="//div[@name='email']" position='inside'>
                <div>
                    <field name="force_mail_queue" class="oe_inline"/>
                    <label for="force_mail_queue"/>
                </div>
            </xpath>
        </field>
    </record>
</odoo>