I purpose create custom mega menu in odoo 17

acording to below links:

https://www.cybrosys.com/blog/how-to-create-menu-pages-and-mega-menu-in-odoo-17#:~:text=Now%2C%20let%27s%20delve%20into%20the%20procedure%20of%20setting%20up%20a%20mega%20menu%20in%20Odoo.

I first create XML file that name menus.xml 

And I put the codes in the XML file according to the links above

In the next step, I will place it in the  manifest 

{
    'data': [
        #...
        'views/menus.xml',
    ],
}

And in the next issue, I will update the theme and restart the server

And then I reload the page, but the mega menu does not appear

I don't know where it is wrong