You'll always know who the Project leader is, as they'll have a crown right next to their name. Only those with an Owner, Member + or Member role can be Project leaders.
As a Project leader, Member + and Members are able to:
- Manage people on projects they're a leader of,
- Move/copy tasks to other projects, but only those projects they have access to,
- Delete comments even after a 30 minutes period has expired,
- Delete any file on a project.