The activity stream tracks the most important events of a task.
As soon as you create a new task or change an existing one, the changes are documented. In this way, it is always possible to track who made which changes in a task and when.
The blue highlighted texts in the activity stream visualize the changed content. The description of a task can be displayed or hidden in this context.
This list of changes or adjustments is displayed in the task dialog on the Activities tab.