You can find theme option below (1,2) and right (3) to the main content area when you edit page/post.
You can make following changes for each page/post type:

  1. Change post layout
  2. Customize Title area
  3. Add additional content between footer and main content area.

Products, portfolio and testimonials posts also have their own settings.

All of the changes will be applied to the current page/post only. If you want to make the same changes to all posts/pages then you can do this in approriate sections of theme settings: Retro / Pages, Retro/ Blog, etc.

Metaboxes in WPBakery Page Builder admin mode:

Metaboxes in WordPress Gutenberg editor: