How do I change the default template file of the store?

I'd like to know which template PHP file is used from my theme to display the main page of the store and the other store pages (product, etc)?

http://figuradekor.staging.wpengine.com/bolt

It seems to me that this is based on the archives.php because it holds place for an empty right sidebar but I can't seem to locate the file I can modify the layout.

Please advise.
Thanks