Hi,
The action of this button is set to return back to the previous page and not to home page. Anyway, if you want to change the location where you want redirect to, please find this file
\CMSModules\Ecommerce\Controls\ShoppingCart\ShoppingCartContent.ascx.cs and find there this method
ButtonBackClickAction(). In this method you can change the behavior by changing this line:
// Continue shopping
UrlHelper.Redirect(this.ShoppingCartControl.PreviousPageUrl);
Best Regards,
Juraj Ondrus