contract/agreement_legal_sale/views/agreement.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>
    <!-- Copyright 2019 Open Source Integrators
         License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl). -->

    <!-- Agreement Form View -->
    <record id="agreement_sale_form_view" model="ir.ui.view">
        <field name="name">agreement.form.view</field>
        <field name="model">agreement</field>
        <field name="inherit_id"
               ref="agreement_legal.partner_agreement_form_view"/>
        <field name="arch" type="xml">
            <page name="signature" position="after">
                <page name="sales" string="Sales">
                    <group>
                        <group id="sale_left">
                            <field name="sale_id" readonly="1"/>
                            <field name="analytic_account_id"/>
                        </group>
                        <group id="sale_right"/>
                    </group>
                </page>
            </page>
        </field>
    </record>

    <menuitem id="agreement.agreement_menu" action="agreement.agreement_action" sequence="100"/>

</odoo>