Download > Install > Activate. That's it!

Once activated, website will be forced into WordPress "maintenance mode" until deactivated. Edit the text to fit your needs, will accept HTML tags. Be sure to purge all caches (browser & server) and be logged out to view.

This code can be pasted into the functions.php file of your child theme or, download and install the plugin for simple code activation.

/*
Plugin Name: Lightweight Plugins - Force Maintenance Mode
Plugin URI: https://lightweightplugins.com/plugin/force-maintenance-mode
Description: Forces website into maintenance mode. Disable plugin to re-enable site.
Version: 1.1
Author: WP Maintenance Experts
Author URI: https://wpmaintenanceexperts.com/
License: GPLv2 or later
*/

function lightweight_plugins_force_maintenance_mode() {
  if (!current_user_can('edit_themes') || !is_user_logged_in()) {
  wp_die('Website Unavailable');
  }
  }
  add_action('get_header', 'lightweight_plugins_force_maintenance_mode');