This page allows you to select which template is used when displaying pages on your storefront.
When the page loads, the current template is shown
In the right sidebar, a button permits you to change the current template.
When the Change the Template button is pressed, a dropdown selector list of available templates is shown.
See the Template Documentation for instructions on creating your own template.
To test a template privately before making it live, use the instructions in privately testing a template.
After changing the template, proceed to the Admin > Tools > Layout Boxes Controller screen to set up sideboxes.