In order to activate the Page Builder, you’ll need the Unyson plugin.
Note: Unyson was removed from WordPress.org and is no longer maintained. These instructions are kept for existing sites that still run it; on a new site, build your layouts with the WordPress block editor instead.
After installing the theme, you’ll see a message at the top that offers to install and activate the plugin quickly:
Install the plugin and Activate it.
After that a new section called Unyson will appear in the dashboard menu:
Go to the Unyson page, and install the Page Builder extension.
Now you can use the Page Builder when you create or edit pages.
Here’s how you can create a new page to use it as front page and how to load the same layout from the demo: