The menu is not showing responsive on a mobile phone or tablet. I have realized that using the main theme instead of the child theme works fine, but I would like to use the child theme, I think the problem is on the functions.php or responsive.css files or elements folder of the child theme.
Even all the other problems I had, the title/breadcrumbs’ bar is not showing the backgorund image or the theme was not responsive on a mobile phone or tablet.