Team
Members and invitations.
Team lists everyone in the workspace. People who were invited and have not accepted yet are shown above the members under Invited, with the role they will get, who invited them and when the invitation expires.
An administrator invites a person with Invite people at the top of the page: an email address and the role they should have — administrator, user or client. The invitation is accepted by signing in or registering with that address, and stays valid for seven days. An open invitation can be revoked from the Invited list, after which its link no longer works; the person can be invited again later. A member's role can be changed and a member removed by an administrator.
A member with the client role sees nothing until attached to a client — Clients. What each role may do is in Roles and permissions.