whatsapp_web_groups/views/ww_group_contact_rel_views.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>
    <data>
        <!-- Vista de lista -->
        <record id="view_ww_group_contact_rel_list" model="ir.ui.view">
            <field name="name">ww.group.contact.rel.list</field>
            <field name="model">ww.group_contact_rel</field>
            <field name="arch" type="xml">
                <list string="Contactos de Grupo" editable="bottom">
                    <field name="group_id"/>
                    <field name="contact_id"/>
                    <field name="is_admin"/>
                    <field name="role_id"/>
                </list>
            </field>
        </record>

        <!-- Vista de formulario -->
        <record id="view_ww_group_contact_rel_form" model="ir.ui.view">
            <field name="name">ww.group.contact.rel.form</field>
            <field name="model">ww.group_contact_rel</field>
            <field name="arch" type="xml">
                <form string="Contacto de Grupo">
                    <sheet>
                        <group>
                            <field name="group_id"/>
                            <field name="contact_id"/>
                            <field name="is_admin"/>
                            <field name="role_id"/>
                        </group>
                    </sheet>
                </form>
            </field>
        </record>

        <!-- Acción de ventana -->
        <record id="action_ww_group_contact_rel" model="ir.actions.act_window">
            <field name="name">Contactos de Grupo</field>
            <field name="res_model">ww.group_contact_rel</field>
            <field name="view_mode">list,form</field>
            <field name="help" type="html">
                <p class="o_view_nocontent_smiling_face">
                    No hay contactos en grupos
                </p>
            </field>
        </record>
    </data>
</odoo>