You can manage the details of your workspace by going to the Settings section in the left navigation bar:
In the left navigation, go to 'Settings' > 'More Settings'.
Under the 'Information' tab you can change the Workspace Image and Name. You can delete the workspace (if your role is admin)
Under the 'Users' tab, you can manage the users who are part of the workspace. Remove them from the workspace or edit their roles. You can also invite more users