Delete mobile menu button [closed]

It’s best to remove these things with custom CSS – https://en.support.wordpress.com/custom-css/ – if you can share the URL you are working on then we can have a look and assist with the CSS.

If you want to be able to install plugins and edit your themes/plugins you will need to setup a self-hosted version of WordPress – http://www.wpexplorer.com/wordpress-com-vs-org/

Edit:

This is the code to remove the menu on mobile only:

@media (max-width: 782px) {
    .navigation-bar {
        display: none !important;
    }
}