EDIT this works, but is outdated information, see the next post - thanks @glemaitre58 - for how to do this properly
If you feel like the course index on the left hand side is too much in your way, you can do this
go to the javascript console - the way to reach that depends on your browser, you may have to look it up, but on chrome/mac for example you can do this by typing⌘⌥i
in the console, type$(".course-index").toggle()
type⌘⌥i
again to get rid of the console