data-protection/privacy_consent/views/privacy_activity.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright 2018 Tecnativa - Jairo Llopis
     License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl). -->

<data>

    <record id="activity_form" model="ir.ui.view">
        <field name="name">Add consent fields</field>
        <field name="model">privacy.activity</field>
        <field name="inherit_id" ref="privacy.activity_form"/>
        <field name="arch" type="xml">
            <div name="button_box" position="inside">
                <!-- TODO Change icon to fa-handshake-o in Odoo 11 -->
                <button
                    attrs='{"invisible": [("consent_required", "=", False)]}'
                    class="oe_stat_button"
                    context='{"search_default_activity_id": active_id}'
                    icon="fa-gavel"
                    name="%(consent_action)d"
                    type="action"
                >
                    <field
                        name="consent_count"
                        widget="statinfo"
                    />
                </button>
            </div>

            <notebook name="advanced" position="inside">
                <page string="Consent" name="consent">
                    <group>
                        <label for="consent_required"/>
                        <div>
                            <field name="consent_required" class="oe_inline"/>
                            <button
                                attrs='{"invisible": [("consent_required", "!=", "manual")]}'
                                class="btn-link"
                                icon="fa-user-plus"
                                name="action_new_consents"
                                type="object"
                                string="Generate missing draft consent requests"
                            />
                            <button
                                attrs='{"invisible": [("consent_required", "!=", "auto")]}'
                                class="btn-link"
                                icon="fa-user-plus"
                                name="action_new_consents"
                                type="object"
                                string="Generate and send missing consent requests"
                                confirm="This could send many consent emails, are you sure to proceed?"
                            />
                        </div>
                    </group>
                    <group
                        attrs='{"invisible": [("consent_required", "=", False)]}'
                    >
                        <group>
                            <field name="default_consent"/>
                            <field
                                name="server_action_id"
                                groups="base.group_no_one"
                            />
                        </group>
                        <group>
                            <field
                                name="consent_template_default_body_html"
                                invisible="1"
                            />
                            <field
                                name="consent_template_default_subject"
                                invisible="1"
                            />
                            <field
                                name="consent_template_id"
                                attrs='{"required": [("consent_required", "=", "auto")]}'
                                context='{
                                    "default_model": "privacy.consent",
                                    "default_body_html": consent_template_default_body_html,
                                    "default_subject": consent_template_default_subject,
                                }'
                            />
                        </group>
                    </group>
                </page>
            </notebook>
        </field>
    </record>

</data>