This template is considered a Single Page Application (SPA). Which means all the elements are on the page and get shown and hidden quickly instead of loading a new page. It works well for Native apps or for quick user experience (some downsides too). For more details on SPAs in general here is a great discussion and Gaby links to her video explanation as well: What do you think...single page vs multi page?
For this specific template, there are ‘Hidden Groups’ (groups not visible on page load) that you can find in the Elements Tree on the left hand side. They become visible using Workflows that are in the Workflows tab. I would recommend creating a Group on the page similar to them or simply putting your content directly the groups that already exist. Hope this helps 