manufacture/mrp_production_operation_injection/views/mrp_production.xml

<?xml version="1.0" encoding="UTF-8" ?>
<odoo>
    <record id="mrp_production_form_view_inherit" model="ir.ui.view">
        <field name="name">mrp.production.form.inherit</field>
        <field name="model">mrp.production</field>
        <field name="inherit_id" ref="mrp.mrp_production_form_view" />
        <field name="arch" type="xml">
            <header position="inside">
                <field name="display_inject_workorder" invisible="1" />
                <button
                    name="action_open_workorder_injector"
                    type="object"
                    string="Inject operation"
                    attrs="{'invisible': [('display_inject_workorder', '=', False)]}"
                />
            </header>
        </field>
    </record>
</odoo>