The Members page is who has access to your workspace. Admins invite people, change roles, remove them, and set the email domains that let teammates join on their own.
Settings > Workspace > Members.
Everyone can open the page. Admins get the management controls, and Members and Viewers see the lists.
Admin has full control of the workspace, billing and settings included.
Member can edit and reply to threads across all public teams. New invites get this role by default.
Viewer has read-only access to workspace content, and is the only role that does not use a billed seat. Viewers still control their own notification preferences, since those affect only them.
Admin and Member seats each count toward what you are billed. Viewers are free and unlimited on every plan.
Pending invites can be withdrawn any time with Cancel invite.
Open the "..." menu on their row, then Change role or Remove member. You cannot manage your own membership from that menu.
Once it shows Verified, anyone with an email on that domain can join. Public email providers cannot be used, and the verification email has to be on the domain you are adding.