Lots of new portfolio options are introduced in the new theme version. You may see some of the possible configurations here. Select Portfolio page template to start working with new portfolio pages. Then you may style all portfolio pages in Portfolio page options section. In case you want to add custom styles to a certain page, find the Portfolio page metabox in page editor and change the settings. You may select various layout tyes, sidebars and columns, hover effects, navigation, content position, appear effects, pagination and more.