In the Library view, when you right click on an ebook one of the options should be either "Delete this Book" (for non-Amazon ebooks you copied to K4PC yourself) or "Remove from Device" (for Amazon ebooks that are archived on Amazon's servers). If you see "Download" instead, then the ebook is archived on Amazon's servers and not currently on your K4PC.
If you select (highlight) an ebook, these options are also under the File tab.
There is usually no need to delete an ebook from Amazon's servers, it is there if you want to read it again. I don't know what happens in K4PC if you do delete it from the server. This might be why you have no delete/remove option. You should at least see other options under a right click, e.g. various "Go to" options.
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