Pay attention that several pages, which come from the demo data and locate under Pages > All pages, cannot be edited with any page builders, either Elementor or WP Bakery, or others.
However, for these pages, you can customize its elements as it's described in this tutorial Customize page elements.
Some of the demo pages were generated automatically from bundled plugins. In this article, we’d like to clear up which page from the demo comes from which plugin. These pages are the following:
From BuddyPress come the following pages:
These pages can be changed under Settings > BuddyPress

We have to point out that Youzify is one of the BuddyPress extensions, so Youzify options are connected with BuddyPress and depend on its settings. The following pages come from the Youzify plugin:
There is no interface where you can anchor these pages, but you can control the settings and styles of these pages under the Youzify panel. Almost all settings related to these pages are located under the Membership Settings tab, but can also be at other tabs.

Here you can read more about Youzify settings.
The following pages come from the WooCommerce plugin:
The default stunning header for the shop pages looks like the following:

Its text and title can be edited via Appearance > Theme Settings > Stunning header > WooCoomerce tab; refer to this article for more details Stunning header.
Its design can be adjusted via Customize > Stunning header > WooCoomerce.
The content of these pages can be set up under WooCommerce > Settings > Advanced tab
The WooCommerce plugin has plenty of options. We recommend referring to WooCommerce's official documentation for more details.
The blog pages of the demo data were created with default WP templates:
To create the same pages, please, refer to our tutorial Blog page.
Separate blogs can be edited under Blog Posts > All posts. Then they will be added automatically to your blog page (classic, grid, masonry, or list). 