Sony Reader PRS-700 Guide De L'utilisateur page 55

Note
 The appearance of the index bar differs depending on the sorting
item. For example, when the list is sorted "by Date," letters do not
appear in the bar.
Switching list display format
You can choose to display the list format in either "List" or
"Thumbnail" view.
In the Option menu, tap "Thumbnail" of "View" to switch the
list display format.
"List" (default)
When you change the list display format, the Audio list and
the Pictures list are also switched to the selected format.
Notes
 In the Book list and the Audio list, the thumbnail can be displayed
only if the book or the track has cover art information.
 Some cover art cannot be displayed, depending on its file format.
 If books or tracks do not have cover art information, the default
image will be displayed in "Thumbnail" list.
"Thumbnail"
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