At the bottom of the page, existing Layout Sections are listed. As you can see in the screenshot below, this area has a very similar layout and functionality to the Avada Builder Library.
Along the top, you can see a summary of your Layout Sections, and what type they are. You can also see this individually on each Layout Section from the colored label in the right column.
When you mouse over a Layout Section, there are a range of options available. Edit is the first one, and this will open it in the back-end interface of the Fusion Builder. Next to this is Clone, which just duplicates the Layout Section in the Layout Sections List. Avada Live is the next link, and this will open the Layout Section for editing in Avada Live. Finally, you can delete your Layout Section with the Trash link. This adds it to the Trash, but does not permanently delete it.
OK, that’s it. To allocate your Layout Sections to specific Layouts, return to the Layouts page, from where you can create and manage your Layouts. If you still need some clarification on the differences between Layouts and Layouts Sections, please follow the link to that doc.