Menu not showing in child theme

Hi,

I created the child theme by referring this link

https://demo.webhuntinfotech.com/blog/2016/01/11/how-to-create-a-child-theme/

And my functions.php files contains following lines

<?php
/** Theme Name: Kyma Child
 *  Custom Functions and Codes
 **/

// Loads Parent Theme CSS Styles In Child Theme
add_action( 'wp_enqueue_scripts', 'child_enqueue_styles',99);
function child_enqueue_styles() {
    $parent_style = 'parent-style';
    wp_enqueue_style( $parent_style, get_template_directory_uri() . '/style.css' );
	 wp_enqueue_style( 'child-style',get_stylesheet_directory_uri() . '/custom.css', array( $parent_style ));
}
if ( get_stylesheet() !== get_template() ) {
    add_filter( 'pre_update_option_theme_mods_' . get_stylesheet(), function ( $value, $old_value ) {
         update_option( 'theme_mods_' . get_template(), $value );
         return $old_value; // prevent update to child theme mods
    }, 10, 2 );
    add_filter( 'pre_option_theme_mods_' . get_stylesheet(), function ( $default ) {
        return get_option( 'theme_mods_' . get_template(), $default );
    } );
}

style.css files contains following lines

/*
   Theme Name: Kyma Child
   Description: This is a custom child theme of kyma theme.
   Author: WP
   Template: Kyma
   Version: 0.1
   */

but when i view the theme in mobile menu doesn’t appears

guide me how can i fix this

testing in localhost ( using Xampp )

Thanks!