I am no expert or super user. And there may be some far more eloquent solutions, but off the top off my head...
You can try making your own covers. I make all my custom covers in Paint. As long as it is less then 10KB in size (and the dimensions I use are 103x153 pixels -- or reduced from that by % if the file size is too big).
Or, you can remove the covers listed in the .thumbnails folder inside the eBooks folder. Then they will all be blue book covers with the file names, or as much of the file name as can be displayed (not the best way to go, unless you are willing to rename the epub files so that you can read them).
If you make your own covers, the new covers MUST have the EXACT same file name as the epub file listed in the EBooks folder. And from what I've seen, the title and author information that the PDN sorts on is not the file name data, but rather found within the epub file somewhere.
I enjoyed making covers...but it is a lot of work. I'd love to know if there's a better solution for you.
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