Direct-Line Indexes filter the list of names in the left window to only show those who are direct ancestors. The full list can be returned by pressing the "Surname Index" button on the menubar available at the top of each page.
Ancestor Charts open in this window, and show the line of ancestry (parents only), four generations per page. A blue triangle at the left or right shows that more generations exist in the direction shown.
Descendent Charts open in this window, and show all the (known) descendents from the earliest known point in the "family name" (the End-of-Line Person) to present time. Please scroll both vertically and horizontally to view the whole chart.