^^&&^^

Edit File: class-kkart-admin-customize.php

<?php
/**
 * Setup customize items.
 *
 * @package Kkart\Admin\Customize
 * @version 3.1.0
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

if ( ! class_exists( 'KKART_Admin_Customize', false ) ) :

/**
	 * KKART_Admin_Customize Class.
	 */
	class KKART_Admin_Customize {

/**
		 * Initialize customize actions.
		 */
		public function __construct() {
			// Include custom items to customizer nav menu settings.
			add_filter( 'customize_nav_menu_available_item_types', array( $this, 'register_customize_nav_menu_item_types' ) );
			add_filter( 'customize_nav_menu_available_items', array( $this, 'register_customize_nav_menu_items' ), 10, 4 );
		}

/**
		 * Register customize new nav menu item types.
		 * This will register Kkart account endpoints as a nav menu item type.
		 *
		 * @since  3.1.0
		 * @param  array $item_types Menu item types.
		 * @return array
		 */
		public function register_customize_nav_menu_item_types( $item_types ) {
			$item_types[] = array(
				'title'      => __( 'Kkart Endpoints', 'kkart' ),
				'type_label' => __( 'Kkart Endpoint', 'kkart' ),
				'type'       => 'kkart_nav',
				'object'     => 'kkart_endpoint',
			);

return $item_types;
		}

/**
		 * Register account endpoints to customize nav menu items.
		 *
		 * @since  3.1.0
		 * @param  array   $items  List of nav menu items.
		 * @param  string  $type   Nav menu type.
		 * @param  string  $object Nav menu object.
		 * @param  integer $page   Page number.
		 * @return array
		 */
		public function register_customize_nav_menu_items( $items = array(), $type = '', $object = '', $page = 0 ) {
			if ( 'kkart_endpoint' !== $object ) {
				return $items;
			}

// Don't allow pagination since all items are loaded at once.
			if ( 0 < $page ) {
				return $items;
			}

// Get items from account menu.
			$endpoints = kkart_get_account_menu_items();

// Remove dashboard item.
			if ( isset( $endpoints['dashboard'] ) ) {
				unset( $endpoints['dashboard'] );
			}

// Include missing lost password.
			$endpoints['lost-password'] = __( 'Lost password', 'kkart' );

$endpoints = apply_filters( 'kkart_custom_nav_menu_items', $endpoints );

foreach ( $endpoints as $endpoint => $title ) {
				$items[] = array(
					'id'         => $endpoint,
					'title'      => $title,
					'type_label' => __( 'Custom Link', 'kkart' ),
					'url'        => esc_url_raw( kkart_get_account_endpoint_url( $endpoint ) ),
				);
			}

return $items;
		}
	}

endif;

return new KKART_Admin_Customize();