Hello,

I just created a new module in odoo 12 and then I modify the views.xml file by adding these lines of code:

<!-- Top menu item -->

    <menuitem name="fmodule" id="fmodule.menu_root"/>

    <!-- menu categories -->

    <menuitem name="test 1" id="fmodule.menu_1" parent="fmodule.menu_root"/>

    <menuitem name="test 2" id="fmodule.menu_2" parent="fmodule.menu_root"/>

    <!-- actions -->

    <menuitem name="List" id="fmodule.menu_1_list" parent="fmodule.menu_1"

              action="fmodule.action_window"/>

    <menuitem name="Server to list" id="fmodule" parent="fmodule.menu_2"

              action="fmodule.action_server"/>

But it does not appear in the menu.