oca-technical/odoo-bringout-oca-brand-contract_brand/contract_brand/views/contract.xml

<?xml version="1.0" encoding="utf-8" ?>
<!-- Copyright 2019 ACSONE SA/NV
     License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl). -->
<odoo>
    <record model="ir.ui.view" id="contract_contract_form_view">
        <field name="model">contract.contract</field>
        <field name="inherit_id" ref="contract.contract_contract_form_view" />
        <field name="arch" type="xml">
            <xpath expr="//field[@name='partner_id']" position="after">
                <field name="brand_id" />
            </xpath>
        </field>
    </record>
    <record model="ir.ui.view" id="contract_contract_search_view">
        <field name="model">contract.contract</field>
        <field name="inherit_id" ref="contract.contract_contract_search_view" />
        <field name="arch" type="xml">
            <xpath expr="//filter[@name='group_by_date_end']" position="after">
                <filter
                    name="group_by_brand"
                    string="Brand"
                    context="{'group_by':'brand_id'}"
                />
            </xpath>
        </field>
    </record>
</odoo>