server-tools/sql_export_mail/views/sql_export_view.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>


    <record id="sql_export_mail_view_form" model="ir.ui.view">
        <field name="model">sql.export</field>
        <field name="inherit_id" ref="sql_export.sql_export_view_form" />
        <field name="arch" type="xml">
            <button name="export_sql_query" position="after">
                <button name="create_cron" string="Create Cron" type="object" groups="base.group_system"
                        attrs="{'invisible': ['|', ('state', '=', 'draft'), ('mail_user_ids', '=', [(6, False, [])])]}"/>
            </button>
            <field name="copy_options" position="after">
                <field name="mail_condition" attrs="{'invisible': [('cron_ids', '=', [(6, False, [])])]}"/>
            </field>
            <group name="parameters" position="after">
                <group groups="sql_request_abstract.group_sql_request_user">
                    <group string="Users Notified by e-mail">
                        <field name="mail_user_ids" nolabel="1"/>
                    </group>
                    <group string="Crons" groups="base.group_system">
                        <field name="cron_ids" nolabel="1" domain="[('function', '=', '_run_all_sql_export_for_cron')]" groups="base.group_system"/>
                    </group>
                </group>
            </group>
        </field>
    </record>

</odoo>