You can make it invisible , or can give access to certain users / groups

<?xml version="1.0"?>
<form string="Backorder creation">
                <group>
                    <p>
                        You have processed less products than the initial demand.
                    </p><p class="text-muted">
                        Create a backorder if you expect to process the remaining
                        products later. Do not create a backorder if you will not
                        process the remaining products.
                    </p>
                </group>
                <footer>
                    <button name="process" string="Create Backorder" type="object" class="oe_highlight"/>
                    <button name="process_cancel_backorder" string="No Backorder" type="object" invisible="1" class="btn-primary"/>
                    <button string="_Cancel" class="btn-secondary" special="cancel"/>
                </footer>
            </form>