I also am a new user (so I could be wrong!) but this is what I've noticed. At the top of the page, we do have the ability to choose Unit that we are looking at. In the lower table, you also have the option to look at which specific assessment you are interested in...so I'm assuming that once we are in Unit 2, I can hide all of unit 1 (including that pre-survey).
That said, I'd love a hide/minimize to collapse the tables that I don't currently want to look at (like the pre-survey)