Your History view consists of two different parts: “Cycle History” and “Parameter History”.

In Cycle History, you have an overview of the basic characteristics of your past cycles. This means that you can see your cycle length, how long your period lasted, and when ovulation took place. 

In Parameter History, you have an overview of your health charts sorted by the parameters that Ava tracks. This means that you can identify some of the parameters' patterns over the course of a cycle.