How do I delete a top-level Lessons page?
Go to the Lessons page you want to remove.
Click on the Lessons Page Title (e.g. Unit #2 to display the page you want to delete.
Click More Tools / Remove Page.
Click Remove.
This removes the page from the Tool Menu but does not remove it from the site.
Next, go to the Index of Pages.
Select page/s, then click Delete selected pages.
You will see the list of pages with the unused pages listed at the bottom. Only items which are not linked from any other location can be permanently removed from the site.
Click Delete selected pages to completely delete the selected page/s from the site.