You need an Administrator login with access to manage Teams if you want to remove members from teams.
To remove a member from a team in ESS:
Go to Teams.
Select the Team.
Click on the ellipsis button (3 dots ...) at the end of the employee's name.
Select Remove from team.
Click Done on the message Remove .... from .... to complete the process. The user will be assigned to the Unassigned team if you remove them from the only team they belonged to.