This is a top level page.
This page (features) is a menu-only item and cannot be clicked on from the menu - it simply acts as a placeholder on the menu so that sub pages are shown when you hover over it. The menu link can also be configured to jump directly to any URL.
Showing a Table of Contents
If a page is also a parent, you can choose to have a sidebar which contains a table of contents (TOC) listing its child (sub) pages. You can enable the table of contents feature for all parent pages which have at least one child page. The table of contents supports an infinite number of nested pages.