Shift + Arrows or Home or End work too. There is a setting to control whether it jumps back to the bottom on other keypresses or stays scrolled back, as well as a setting for how much memory to use for scroll history.
That miniview option isn't as good as it first appears to be tho. I wish it functioned as a scroll history and a scrollbar like sublime-text or something, but instead it only shows the past few pages, plus it obscures the terminal below it.
I've often wished for a real scrollbar or usable miniview in terminology.