I'm not sure you can. It is not too much to click on shared files at the top of the column.
The pictures, ..... artwork are another thing ... and afaik this only occurs in Windows, and not in Mac.
I have a theory that you need to open the id3tag and remove the artwork from there, which I know you can do with iTunes. I'm guessing, as I use a Mac and have only heard of this complaint from Windows users. It might be worth a try. Let us know if it works.
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