To put your store in 'Maintenance' mode go to Settings> Store Settings > DIsplay > Store Closed.

  • You can also configure a custom store closed page to display for any customs who get to your website while this mode is enabled.
  • You can re-enable by clicking Open Store at the top of your admin. 
  • You can also click on View the store as a customer or admin 
  • This is useful if you wish to use this as a type development mode.