The redlining features allow you to see what changed between two points in time or between two document releases.
It consists of these functions:

The Redlining dashboard allows you to select two dates and see the list of items in the project with information on whether they were identical, different or existing in only one of the dates. The list can be filtered and the differences can be explored further if needed.

The timewarp feature allows you to see the project as it was at some point in the past. In the tree, all items are marked in red if the current version is different. The bottom tab of your instance will be red as well.

The timewarp can be started from the Redlining Dashboard

This function allows you to compare a document in different states (as DOC and SIGNed). It shows a list of items included in each version of the document and the differences between them.