This tab contains the remaining course options that don't fit in the previous two tabs - it's mainly where a course's ancillary files can be managed and edited.
(Click image to enlarge)
Namely, it allows you to rename the course directory folder in which all the course files are contained, and allows you to access and edit a course’s ancillary (supplementary) files - specifically, Glossary and References lists, and a Help page. See 'Additional Windows' for help with editing these aspects.
There is also a button to Manage Media attached to the course - this includes both images and any attached documents (such as PDF files).