Understand has many customizations and features hidden behind the right click menu. For example the easiest way to graph a function is right click it and select graphical views.
You can right click on an empty section of a graph to change it’s layout options:
You can customize what information the Info Browser shows and the format it shows in by right clicking on that section’s title.
Among other things, the editor has right click options to comment and uncomment the selection, re-indent it, compare it to other selections or even sort/alphabetize it.
There are dozens of other features available by right clicking in Understand, so don’t hesitate to explore!