Available to Project Owner.
When planning a Project, you have the chance to list the people who will involve in the Project. You can add Collaborators and define their Project Role. If the Project was created by copying from another Project, you might want to remove the Collaborators that were copied.
It is best to finalize the list of Collaborators during planning. However, under certain conditions, you can still manage the Collaborators when the Project is already live.
To know the steps on how to manage Collaborators, please refer to their pages: