partner-contact/partner_contact_department/views/res_partner_department_view.xml

<?xml version="1.0" encoding="utf-8" ?>
<odoo>
    <record id="res_partner_department_action" model="ir.actions.act_window">
        <field name="name">Departments</field>
        <field name="res_model">res.partner.department</field>
        <field name="view_mode">tree</field>
    </record>
    <record id="res_partner_department_tree_view" model="ir.ui.view">
        <field name="name">CRM department tree</field>
        <field name="model">res.partner.department</field>
        <field name="arch" type="xml">
            <tree string="Departments" editable="top">
                <field name="name" />
                <field name="parent_id" />
            </tree>
        </field>
    </record>
    <record id="res_partner_department_form_view" model="ir.ui.view">
        <field name="name">CRM department form</field>
        <field name="model">res.partner.department</field>
        <field name="arch" type="xml">
            <form>
                <group>
                    <field name="name" />
                    <field name="parent_id" />
                    <field name="child_ids" />
                </group>
            </form>
        </field>
    </record>
    <menuitem
        action="res_partner_department_action"
        id="menu_res_partner_department"
        parent="contacts.res_partner_menu_config"
    />
</odoo>