[kevin4fly]

I wanna see the debug output of my conversion and I have read this:

Paragraph 7.7 (134.0 / 1356) of the calibre user manual: "You can see this process in action by using the debug option . Just specify the path to a directory for the debug output."

As far as I know, I set the calibre to debug mode by right clicking the Preference button and selecting Restart in debug mode. Then calibre restarts, however, at this moment, how to "specify the path to a directory for the debug output"?

I do know how to do it in command line interface of calibre: ebook-convert input_file output_file -d -vv, now I wanna know how to in GUI.