Steps
Click Settings in the bottom-left corner of your dashboard
Select "Workspace Users"
Find the member you want to remove in the user list
Click the three-dot menu next to their name
Select "Remove from workspace" from the dropdown
Confirm the removal action in the pop-up
The member will lose access to all workspace boards
Notes
Removing a member is permanent and immediate
The member will lose access to all boards in this workspace
They can be re-invited later if needed
Consider deactivating instead of removing if they might return