Hi,

Please check the code below:

<record id="product_template_tree_view" model="ir.ui.view">
    <field name="name">product.template.view.tree.inherit</field>
    <field name="model">product.template</field>
    <field name="inherit_id" ref="product.product_template_tree_view"/>
    <field name="arch" type="xml">
        <!-- Replace the entire tree content -->
        <xpath expr="//tree" position="replace">
            <tree string="Product" multi_edit="1" sample="1">
                <header>
                    <button string="Print Labels" type="object"
                            name="action_open_label_layout"/>
                </header>
                <field name="name" string="Product Name"/>
                <field name="default_code" string="Product Reference"/>
                <field name="categ_id" string="Product Category"/>
            </tree>
        </xpath>
    </field>
</record>

Hope it helps.

go to the settings -> and end of the page you can see activate developer mode
go to the product list view

open the edit view: List
you can add , these 3 lines  below