odoo form 去掉复制按钮

<form string="Session"  duplicate="false">

 <record id="helpdesk_tickchat_uuid_view_form" model="ir.ui.view">
            <field name="name">helpdesk.livechat.uuid.view_form</field>
            <field name="model">helpdesk.livechat.uuid</field>
            <field name="type"> </field>
            <field name="arch" type="xml">
                <form string="Session"  duplicate="false">
                    <sheet>
                        <group>
                             <field name="channel_id"/>
                            <field name="last_uuid_time"/>
                            <field name="uuid_user_id"/>
                            <field name="anonymous_name"/>
                            <field name="team_id"/>
                        </group>
                    </sheet>
                </form>
            </field>
        </record>