odoo16/addons/stock_dropshipping/views/sale_order_views.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>
    <data>
        <record id="view_order_form_inherit_sale_stock" model="ir.ui.view">
            <field name="name">sale.order.form.sale.dropshipping</field>
            <field name="model">sale.order</field>
            <field name="inherit_id" ref="sale.view_order_form"/>
            <field name="arch" type="xml">
                <xpath expr="//button[@name='action_view_delivery']" position="before">
                    <t groups="purchase.group_purchase_user">
                        <button type="object"
                            name="action_view_dropship"
                            class="oe_stat_button"
                            icon="fa-truck"
                            attrs="{'invisible': [('dropship_picking_count', '=', 0)]}" groups="stock.group_stock_user">
                            <field name="dropship_picking_count" widget="statinfo" string="Dropship"/>
                        </button>
                    </t>
                </xpath>
           </field>
        </record>
    </data>
</odoo>