If you're subscribed to a team plan, you can add and remove teammates from within the Manage Team page.
Click your profile image in the bottom right-hand corner and select Manage Team from the menu.
Find the user you'd like to remove and hover to the right of their name. To remove them from the team, select Archive user.
You can add them again at any time! Select the level of access (admin, full or restricted) that you’d like to give them to restore their place on the team.