Version 4.0 has a completely redesigned UI and many functions aren't where they used to be. In fact, some are so well tucked away that they seem hidden, and more than one App Store reviewer believes certain functions are just gone.
For example, some customers are saying that scheduled adjustments are gone, but they're just harder to find. You must click on the thermostat first to maximize it, then a menu icon at the upper right will reveal things like energy history and the scheduler. When the thermostat is not maximized, the same icon does something else. Oops.