When creating and/or editing subscriptions, you can plan for future changes in the subscription. This can be changes such as ramp-ups, discounted initial period followed by full price, etc. Read more about how to set up common subscriptions with periods here.
When creating a subscription with future changes, these are applied by adding periods to the subscription. A subscription can contain up to two periods, where each period lasts during specific dates and can have different terms. Planned future periods are listed under the heading "upcoming changes", whereas periods that have already occurred in the subscription are listed under "passed changes".
For each period, you can quickly see how the period will change in annual or monthly value. If you want to see how the subscription period will look like when the change period starts, click on the row and the period will be opened up.