This is the last post of our sequence dedicated to ActivityPub groups. It covers how replies are fetched, organized and laid out inside the detail screen for each thread in a given topic. We will describe the tree-like structure of replies, with particular attention on which visual guidelines are added to make it easier to identify relationships between posts. We will then proceed to describe how the structure can be recreated using the available APIs, how the tree is linearized to a user-digestible list and how the points where the tree was pruned are identified.