When reading a document you may choose to display the summaries either in “Grouped” or “Ungrouped” mode.
In “Ungrouped” mode, the summaries will appear next to their relevant part in the document, and both the document and the summaries will scroll simultaneously. Therefore, if there are long gaps in the text (for example, a few pages with images), you will have to scroll further down to see the next summary. This is the default mode.
In “Grouped” mode, the summaries will be stacked on with no gaps, and scrolling the document and the summaries is independent. This mode allows a quicker read through all the summaries. In this mode, pressing on a summary will scroll the document to the relevant part if it is not visible.