Constellation Web
Click on the previous or back arrow button on the side of the reader pane. The previous arrow button will take you back one section at a time. You may also navigate via the Table of Contents. To do this click the Content button on the toolbar. Clicking on it will drop down a table of contents menu that tells you the chapter and section you are in and lets you navigate to any chapter or section within the material.
Constellation Application
To navigate to the previous section you can swipe backward to reach the previous section. You may also navigate via the Table of Contents. To do this, tap the Content button on the toolbar. Doing so will drop down a table of contents menu that tells you the chapter and section you are in and lets you navigate to any chapter or section within the material.