[whpalmer4]

If you press and hold on one of the triangles next to the Context name on the right side, you'll get a popup which offers choices of Collapse All, or Expand All and Collapse All, depending on whether it was expanded or collapsed when you did so. A single tap on the button just toggles the state. Collapse All and open just the context that interests you...not quite as clean as drilling into just one context, but on the other hand, it allows you to have selected contexts open simultaneously, which the Contexts view does not.