The Default Blog is the page that you select as your post page in your WordPress panel from Dashboard > Settings > Reading. This blog page type can not be edited with Elementor nor with WPBakery Page Builder. However, you can see the Blog page options in Appearance > Theme Options > Blog Page.
You can set your default blog page as shown up in the screenshot below
You can see the default blog page options in Theme Options > Blog Page as shown up in the screenshot below.
If you prefer to build your own custom blog page rather than the default blog page, you can easly do it with Elementor or WPBakery Page Builder ( whichever page builder you’re using ). What you simply need to do is create a new page with a page layout you want. Then, use a blog widget to display your blog post items. It’s completely up to you to design your blog page with the page builder you’re using.
You may have a look the following sample video to see how to build a custom blog page. The theme that is used in the video is Wavo elementor template.