The Primary text document view contains a Table of Contents and tools for downloading, printing and saving. It also contains a list of Related items.
If your search terms appears in the Primary work full text, then occurrences of the keyword in the text are by default highlighted in yellow. Clicking Turn on the search term navigation means you can then click Jump to first hit to go to the first occurrence of the keyword in the text. Then use the arrow icon at the first hit to jump to the second hit, etc.
For more details about document view features, click here.