I am looking at the Family View (descendant tree style) from the uppermost ancestor.
If I have to click on little arrows as you suggested, then that pretty much answers my question: I can't view the entire tree at once simply by scrolling up/down and left/right. Why can't I view all branches at the same time like I can on FTM v16 (descendant tree)?? That's ridiculous.
Also, the little box in the bottom left corner (interactive mini-map guide) serves no purpose whatsoever. For a web site that's considered the #1 genealogy site, these drawbacks are a big disappointment.