I have over 20Gb of books on my external hard drive, I had them organised into folders by Fiction, Non-Fiction, Reference, etc. With so many books sometimes I have trouble finding them, so I downloaded Calibre yesterday to see if it would make it easier, I thought it would make an index of the books but to my horror the software has created 426 folders inside my EBOOK directory and seems to have shuffled my books all over the place

It will take me weeks to undo this mess, please tell me there is a hidden undo feature somewhere