User Interface of DLNA Player without video thumbnails

[enricogr]

In my UE40JU6410 when I open the DLNA player I see a grid where each video/song is a square with the short name in small font, but the square is empty, while it should provide some thumbnail of the video/song, I guess.

Does someone knows how to fill videos with thumbnails?

Or is there any way not to have this grid with empty squares, but instaed a simple list with long names?