ACF - Advanced custom fields reorder menu item

acf-options.php

<?php 
/**
 * Theme options for custom mega menu
 */
if( function_exists('acf_add_options_page') ) {

  $theme_option = 'theme-options';

  acf_add_options_page(array(
    'page_title' => 'Theme Settings',
    'menu_title' => 'Theme Settings',
    'menu_slug'  => $theme_option,
    'capability' => 'edit_posts',
    'icon_url'   => 'dashicons-admin-settings',
    'position'   => 2,
    'redirect'   => false
  ));

  acf_add_options_sub_page(array(
    'page_title'  => 'Main menu',
    'menu_title'  => 'Main menu',
    'parent_slug' => $theme_option,
  ));
}

// Put an options page on a custom post type
if( function_exists('acf_add_options_page') ) {
  $where = 'banners';
  acf_add_options_sub_page(array(
    'title'       => 'Banner settings',
    'parent'      => 'edit.php?post_type=' . $where,
    'parent_slug' => $where,
    'capability'  => 'manage_options'
  ));
}