Portfolio is based on page template, there are four types of portfolio templates available, each represents a different look. You can assign your template to a page from the right panel on that page. See the screenshot below. There are additional settings for that template once you choose it. Setting may differ from template to template.
Types of portfolio layouts
Portfolio – Gird – example here http://erwitt.puruno.com/1/index/
Portfolio – slider 1 – example here http://erwitt.puruno.com/1/
Portfolio – slider 2 – example here http://erwitt.puruno.com/1/home3/
Portfolio – slider 3 – http://erwitt.puruno.com/1/home4/