How to publish a landing page on Wordpress?

Question

CMS

In the "Templates" section there is a "Landings" tab, when you click on it, a list of ready-made landing pages templates opens, when you select one of them (not PRO), the editor opens. While editing, "Preview" works, but it's worth "Publish" as the page disappears. When I open it, I get an error: Page not found. Where does she go? I wanted to take this template for the main page, but nothing happens(