Choosing your website's type is important and helps you decide how your users will navigate in your website.
With A "Multi-page" Website, every page will be shown separately. When clicking on a link from the menu, the user will be redirected to each page. With a "Single Page" Website, all pages will be displayed on the same page, so when clicking on a link from the menu, the browser will scroll down to the relevant part of the page.
To choose between "Single Page" and "Multi-page" website type:
With the Single Page type, you can enable the Sliding Window option, which will open all inner pages in a sliding popup window.