Example: 1

<record id="contacts.action_contacts" model="ir.actions.act_window">
<field name="view_mode">kanban,tree,form,activity,pivot</field>
</record>

Example: 2

<record id="res_partner_view_pivot" model="ir.ui.view">
<field name="name">res.partner.view.pivot</field>
<field name="model">res.partner</field>
<field name="arch" type="xml">
<pivot string="New Pivot Res partner" sample="1">
<field name="phone" widget="phone"/>
<field name="mobile" widget="phone"/>
<field name="user_ids" invisible="1"/>
</pivot>
</field>
</record>