partner-contact/partner_capital/views/res_partner_view.xml

<odoo>
    <record id="view_partner_form_capital" model="ir.ui.view">
        <field name="name">Partner form with capital info</field>
        <field name="model">res.partner</field>
        <field name="inherit_id" ref="base.view_partner_form" />
        <field name="arch" type="xml">
            <xpath expr="//page[@name='sales_purchases']/group" position="inside">
                <group
                    name="capital"
                    string="Capital"
                    attrs="{'invisible': [('is_company', '=', False)]}"
                >
                    <field name="capital_amount" />
                    <field name="capital_currency_id" />
                    <field name="capital_country_id" />
                    <field name="turnover_amount" />
                    <field name="turnover_range_id" />
                    <field name="company_size" />
                </group>
            </xpath>
        </field>
    </record>
    <record id="view_res_partner_filter_capital" model="ir.ui.view">
        <field name="name">Partner search with capital</field>
        <field name="model">res.partner</field>
        <field name="inherit_id" ref="base.view_res_partner_filter" />
        <field name="arch" type="xml">
            <filter name="salesperson" position="after">
                <filter
                    string="Capital country"
                    name="capital_country"
                    domain="[('is_company', '=', True)]"
                    context="{'group_by': 'capital_country_id'}"
                />
                <filter
                    string="Turnover"
                    name="turnover"
                    domain="[('is_company', '=', True)]"
                    context="{'group_by': 'turnover_range_id'}"
                />
                <filter
                    string="Company size"
                    name="company_size"
                    domain="[('is_company', '=', True)]"
                    context="{'group_by': 'company_size'}"
                />
            </filter>
        </field>
    </record>
</odoo>