shred with bleachbit

Hello, could someone explain how the "destroy files/folders" function works? Does it overwrite the data or simply delete it without going through the Recycle Bin?
English isn't really my first language, and I'm not sure I fully understand the information in the documentation.

Thanks

Hi to all,
after installing the latest update whenever I double click on a folder bleachbit opens and asks to delete the folder, how can I prevent this from happening?
The shred with bleachbit option is right on the top in black bold on my right click options.
I really like bleachbit but I've had to unistall it due to these reasons, I tried to search the forums for some help and was unable to find anything.
Any solution to this would be very helpful thanks, Xyru.