There are three ways to remove users from within Synapse:
Remove Admins from an Account
If you would like to remove an Admin from your account, please contact: firstname.lastname@example.org.
Remove Users/Design Owners from an Account
As an Admin, you can remove users/Design Owners from your account by following these steps.
Visit the Users section on the dashboard.
Click the three dots to the right of the user's name.
Remove Collaborators from a Design
As a Design Owner, or as an Admin, you can remove Collaborators from a specific design.
Visit the design you'd like to remove the Collaborator from.
Click the collaboration icon.
Click the three dots to the right of the Collaborator's name.