The current way to open the main Canvas navigation from New Quizzes is the Return button on the top right. First, there is no rhyme or reason why anyone would consider looking at the top right to find something that is always on the right, next, the word "return" does not make sense considering the user has no idea that they are using an external tool - for now. I just hope that the developers will fix that navigation because our faculty need all the help they can get.