From the linked Calibre FAQ: > Why doesn’t calibre let me store books in my own folder structure? > ... a search/tagging based interface is superior to folder

From the linked Calibre FAQ: > Why doesn’t calibre let me store books in my own folder structure? > ... a search/tagging based interface is superior to folders ... > ... much more efficient than any possible folder scheme you could come up with ... Quite opinionated software. That and the quirky UI are reasons why I only use Calibre for a conversion or de-DRM here and there. Jump in, flail around until task done, fast exit.