The Bible text is presented chapter by chapter. At the bottom of the screen you will see arrow buttons (left/right) to open the previous and next chapters. When scrolling, they are automatically hidden. To show them again, scroll the website up a bit.
Alternatively, you can navigate through the Bible text using the arrow keys (left/right) on the keyboard. On devices with a touch screen (e.g. smartphones) you can navigate through the chapters with a wipe gesture.
To get an overview of all contents (outline) of a biblical book, click on the Book selection in the upper left corner of the search box and then on the list icon in the lower right corner of the chapter tab.