Sony DCR-TRV39 - Manual (Page 68)

Display Control buttons Buttons for sorting thumbnails are also located here.
Image Edit button
Allows the source file of a selected still picture thumbnail to be
edited.
Thumbnail list window
Thumbnails related to movies, still pictures, and sound files are
shown here. You can use the display control buttons to effectively
"filter out" those file types you do not wish to be displayed.
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