Maintenance mode
Maintenance mode allows you to make changes to your store behind the scenes, while everyone else sees your Maintenance page. This is a good idea anytime you need to make significant changes to your store’s styles, pages, or products.
You can turn on maintenance mode on the Store > Settings page, and paid plans have the ability to edit their Maintenance page in the Advanced pane of their admin design area.
Maintenance Bar
While your store is in maintenance mode, we will add a handy "maintenance bar" to the top of your store. This bar gives you tools to quickly switch between pages, edit the current page, and easily access different parts of the admin.
Note that your products RSS feed, site map and external API will be unavailable while your store is in maintenance mode.