partner-contact/partner_deduplicate_acl/wizards/partner_merge_view.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright 2016 Tecnativa - Jairo Llopis
     Copyright 2016 Tecnativa - Vicent Cubells
     Copyright 2018 Tecnativa - Pedro M. Baeza
     License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html). -->
<odoo>

        <record id="base_partner_merge_automatic_wizard_form" model="ir.ui.view">
            <field name="name">Restrict automatic merge access</field>
            <field name="model">base.partner.merge.automatic.wizard</field>
            <field name="inherit_id" ref="crm.base_partner_merge_automatic_wizard_form"/>
            <field name="arch" type="xml">
                <xpath expr="//button[@name='action_start_automatic_process']" position="attributes">
                    <attribute name="groups">crm_deduplicate_acl.group_automatically</attribute>
                </xpath>
                <xpath expr="//button[@name='action_update_all_process']" position="attributes">
                    <attribute name="groups">crm_deduplicate_acl.group_automatically</attribute>
                </xpath>
            </field>
        </record>

        <record id="crm.action_partner_merge" model="ir.actions.act_window">
            <field name="groups_id" eval="[(4, ref('crm_deduplicate_acl.group_manually'))]"/>
        </record>

</odoo>