partner-contact/partner_contact_gender/views/res_partner.xml

<?xml version="1.0" encoding="utf-8" ?>
<odoo>
    <record id="view_personal_information_gender" model="ir.ui.view">
        <field name="name">Partner gender: personal info</field>
        <field name="model">res.partner</field>
        <field
            name="inherit_id"
            ref="partner_contact_personal_information_page.personal_information"
        />
        <field name="arch" type="xml">
            <xpath
                expr="//page[@name='personal_information_page']//group[@name='personal_information_group']"
            >
                <field name='gender' />
            </xpath>
        </field>
    </record>
</odoo>