odoo16/addons/event_sale/views/event_views.xml

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

    <record id="view_event_form_inherit_ticket" model="ir.ui.view">
        <field name="name">event.form.inherit</field>
        <field name="model">event.event</field>
        <field name="inherit_id" ref="event.view_event_form"/>
        <field name="priority" eval="20"/>
        <field name="arch" type="xml">
            <xpath expr="//button[@name='%(event.act_event_registration_from_event)d']" position="after">
                <field name="currency_id" invisible="1"/>
                <button name="action_view_linked_orders"
                        type="object" class="oe_stat_button" icon="fa-dollar"
                        groups="sales_team.group_sale_salesman"
                        help="Total sales for this event"
                        attrs="{'invisible': ['|', ('sale_price_subtotal', '=', 0), ('sale_price_subtotal', '=', False)]}">
                    <div class="o_field_widget o_stat_info">
                        <span class="o_stat_value">
                            <field string="Sales" name="sale_price_subtotal"
                                widget="monetary" options="{'currency_field': 'currency_id'}"/>
                            </span>
                        <span class="o_stat_text">Sales</span>
                    </div>
                </button>
            </xpath>
        </field>
    </record>

</odoo>