server-ux/sequence_range_end/views/sequence_views.xml

<flectra>
    <record id="sequence_view" model="ir.ui.view">
        <field name="model">ir.sequence</field>
        <field name="inherit_id" ref="base.sequence_view" />
        <field name="arch" type="xml">
            <xpath expr="//page/group[last()]" position="after">
                <group attrs="{'invisible': [('use_date_range', '=', False)]}">
                    <div>
                        You can also use 'range_end_' to use the end date of the range, e.g. %%(range_end_year)s.
                    </div>
                </group>
            </xpath>
        </field>
    </record>
</flectra>