social/mail_digest/views/user_views.xml

<?xml version="1.0"?>
<odoo>
    <record id="view_users_form_mail" model="ir.ui.view">
        <field name="name">mail_digest res.users notification settings</field>
        <field name="model">res.users</field>
        <field name="inherit_id" ref="mail.view_users_form_mail"/>
        <field name="arch" type="xml">
            <field name="notify_email" position="replace">
                <group name="notif_left">
                    <field name="notify_email" widget="radio" readonly="0"/>
                    <field name="notify_frequency" readonly="0"
                           attrs="{'invisible': [('notify_email', '!=', 'digest')]}" />
                </group>
                <group name="notif_right" attrs="{'invisible': [('notify_email','=', 'none')]}">
                    <label string="Enable/disable notifications by type" colspan="4" />
                    <field name="notify_conf_ids" nolabel="1" colspan="4" readonly="0" />
                </group>
            </field>
        </field>
    </record>


    <record id="view_users_form_simple_modif_mail" model="ir.ui.view">
        <field name="name">mail_digest res.users notification preferences</field>
        <field name="model">res.users</field>
        <field name="inherit_id" ref="mail.view_users_form_simple_modif_mail"/>
        <field name="arch" type="xml">
            <field name="notify_email" position="replace">
                <group name="notif_left">
                    <field name="notify_email" widget="radio" readonly="0"/>
                    <field name="notify_frequency" readonly="0"
                           attrs="{'invisible': [('notify_email', '!=', 'digest')]}" />
                </group>
                <group name="notif_right" attrs="{'invisible': [('notify_email','=', 'none')]}">
                    <label string="Enable/disable notifications by type" colspan="4" />
                    <field name="notify_conf_ids" nolabel="1" colspan="4" readonly="0" />
                </group>
            </field>
        </field>
    </record>
</odoo>