reporting-engine/report_label/views/ir_actions_server.xml

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

    <record id="view_server_action_form" model="ir.ui.view">
        <field name="model">ir.actions.server</field>
        <field name="inherit_id" ref="base.view_server_action_form"/>
        <field name="arch" type="xml">
            <header position="inside">
                <button
                    name="report_label_associated_view"
                    type="object"
                    string="View QWeb templates"
                    attrs="{'invisible':['|', ('state', '!=', 'report_label'), ('label_template', '=', False)]}"
                    help="Display a button in the sidebar of related model to open a wizard"
                />
            </header>
            <field name="type" position="after">
                <field name="label_paperformat_id" attrs="{'invisible': [('state', '!=', 'report_label')]}"/>
                <field name="label_template" attrs="{'invisible': [('state', '!=', 'report_label')]}"/>
            </field>
        </field>
    </record>

    <record id="report_label_action" model="ir.actions.act_window">
        <field name="name">Label Reports</field>
        <field name="res_model">ir.actions.server</field>
        <field name="view_type">form</field>
        <field name="view_mode">tree,form</field>
        <field name="domain">[("state", "=", "report_label")]</field>
        <field name="context">{"default_state": "report_label"}</field>
    </record>

    <menuitem
        id="report_label_menu"
        name="Label Reports"
        action="report_label_action"
        parent="base.reporting_menuitem"
        sequence="3"/>

</odoo>