On Collect, you can add your data collectors as either members or managers. This article tells you the difference between the roles.
About a Member:
Someone who is added as a member of a team can only collect data using their Collect app. They can not view details of other data collectors or add/remove them.
About a Manager:
Someone who is added as a manager of a team can collect data. But they can also manage other data — they can add or remove other members from a team.
It is advised to only add those data collectors as managers who need to have this authority. Each team should ideally only have one manager.