contract/product_contract/views/res_config_settings.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="res_config_settings_form_view">
        <field name="name">res.config.settings.form (in product_contract)
        </field>
        <field name="model">res.config.settings</field>
        <field name="inherit_id" ref="sale.res_config_settings_view_form"/>
        <field name="arch" type="xml">
            <xpath expr="//div[@id='sales_settings_invoicing_policy']/.."
                   position="inside">
                <div class="col-12 col-lg-6 o_setting_box">
                    <div class="o_setting_left_pane">
                        <field name="create_contract_at_sale_order_confirmation"/>
                    </div>
                    <div class="o_setting_right_pane">
                        <label for="create_contract_at_sale_order_confirmation"/>
                        <div class="text-muted">
                            Automatically Create Contracts At Sale Order Confirmation
                        </div>
                    </div>
                </div>
            </xpath>
        </field>
    </record>


</odoo>