function plt_hide_speedx_maintenance_mode_menus() {
//Hide the "Tools → Maintenance Mode" menu.
remove_submenu_page('tools.php', 'spx1mm-settings');
//Hide the "Settings → Maintenance Mode" menu.
remove_submenu_page('options-general.php', 'spx1mm-settings');
}
add_action('admin_menu', 'plt_hide_speedx_maintenance_mode_menus', 11);