If a client requests a URL that designates a directory and the directory does not contain a filename that matches the DirectoryIndex directive, then mod_autoindex can be configured to present a listing of the directory contents.
To turn on automatic directory indexing, find the Options directive that applies to the directory and add the Indexes keyword.
For example:
<Directory /path/to/directory>
Options +Indexes
</Directory>
To turn off automatic directory indexing, remove the Indexes keyword from the appropriate Options line. To turn off directory listing for a particular subdirectory, you can use Options -Indexes.
For example:
<Directory /path/to/directory>
Options -Indexes
</Directory>