app-odoo/app_contacts_searchpanel/views/res_partner_views.xml

<odoo>
  <data>
      <!-- contact -->
    <record id="app_res_partner_kanban_view" model="ir.ui.view">
        <field name="name">app.res.partner.kanban</field>
        <field name="model">res.partner</field>
        <field name="inherit_id" ref="base.res_partner_kanban_view"/>
        <field name="arch" type="xml">
              <xpath expr="//templates">
                  <searchpanel>
                      <field name="user_id"/>
                      <field name="country_id"/>
                  </searchpanel>
              </xpath>
        </field>
    </record>
  </data>
</odoo>