The row template grants you a preview of parts of the record in the grid.
Clicking the arrow to the left of a row expands the row and shows, by default, the cover of the book, the location and the summary.
To define what shows in this preview, use the Row Template tab when editing a page view.
The fields that display in the row preview are shown in the 'Display Fields' box. To add a field to the display fields, select one from under 'Available Fields' and use the right arrow to move it to the 'Display Fields'.
Click 'Save' to keep the changes.
If you do not wish to use a row template, simply remove all columns from 'Display Fields' and save the view.