If you prefer to manually edit your configuration files, use the following syntax for this option:

#Descend to the third level of the directory tree
directorydepth 3

The How Many Levels Deep (Directory Depth)? ^{(directorydepth)} option indicates how far the Chart Documents by Directory ^{(directories)} report should descend into the directory tree of the web server. A directory depth of 1 means that only the top-level directory's contents are listed. A directory depth of 2 (the default) means that top-level and second-level directories are listed.

You can also limit the number of items shown at each level using the How Many Items at Each Level? ^{(topdirectories)} option.