Savant web server, how to enable directory listing?

I have installed a Savant Web Server on a Windows Machine for serving a web page in the .onion format accessible at the following URL : http://v2yuk5mtczbjvtll.onion/index.html

I have created a directory in which I want to put some public files but I cannot browse the files in it.

I think that I should set a parameter that would enable the directory listing.

How to do that ?

The public directory is : http://v2yuk5mtczbjvtll.onion/testdir

Thanks