Hm, I thought there was an option for that, but the option is only for toggling/resetting the tutorial
messages.
To get the actual tutorial area you would have to delete your /user/game.bin file. (Ideally you'd save a copy of that elsewhere, or rename the original, in order to restore it when done fooling around in order to keep your meta stats like discovered part totals.)
Of course, note that this exploit no longer works as of Alpha 2
I should probably make the tutorial message toggle also reset the tutorial area as well.