It depends on your role in the project. At this time:
The main author (or document owner) can see all comments, whether left by themselves or any collaborator.
Collaborators (co-authors, editors, or beta readers) can only see their own comments and any replies from the main author to their comments.
You can learn more about the various aspects of Collaboration and collaboration roles in these tutorials: https://www.atticus.io/tutorials/#Collaboration