The Storefront WooCommerce Customizer extension gives you additional style and layout options for the WooCommerce sections of your Storefront powered web site.
This extension integrates with the WordPress Customizer making it extremely simple to use. Once you enter the Customizer you will notice a new top-level section: Checkout.
The Storefront Checkout Customizer settings menu item will only display if you are viewing the WooCommerce Checkout page from within the customizer and the settings should be self-explanatory, but let’s work through what each one does:
Here you can specify a preset layout option for your checkout.
The options are:
Default – the default layout
Stacked – Stacks the address inputs and order review atop one another
Two column addresses – arrange the address inputs into two columns above the order review
When combined with the full-width template already available in Storefront core this allows you to create 6 different checkout designs.