Team is who can open this workspace. Invite people you work with. Do not invite personal accounts into a company workspace.
Each row is a person, their role, and whether the invite is pending.
Information
Open Team from Settings, then Team.
Invite
Send an invite by email. They join with the same sign-in they already use.
Set a role
Member can use Chat, Mail, and the rest of the workspace. Admin can invite, remove, and change billing.
If you are not an admin you will not see invite or remove. That is expected.
Leave from Team if you no longer need the workspace. Your personal account remains. Threads you wrote stay with the workspace unless an admin deletes them.