partner-contact/partner_contact_in_several_companies/demo/ir_actions.xml

<?xml version="1.0" encoding="UTF-8"?>
<odoo>
    <record id="action_partner_form" model="ir.actions.act_window">
        <field name="name">All Customers in All Positions</field>
        <field name="type">ir.actions.act_window</field>
        <field name="res_model">res.partner</field>
        <field name="view_type">form</field>
        <field name="view_mode">kanban,tree,form</field>
        <field name="context">{"search_default_customer":1, 'search_show_all_positions': {'is_set': True, 'set_value': True}}</field>
        <field name="search_view_id" ref="base.view_res_partner_filter"/>
    </record>
</odoo>