On the Employees list click the Delete (trash) icon in the row and confirm "Are you sure that you want to delete this Employee?". Deleting removes the employee record and every task assigned to that employee; the underlying user account, past timecards and shifts are not removed. Deletion requires the Proposals module to be enabled — otherwise the request fails with "Proposals module is not enabled". In the current version this button does not work: the page sends the delete request to the wrong web address, so it always fails and the employee is never actually removed (the row reappears after the page refreshes). Until this is fixed, set Is Active? off on the employee's profile instead, or ask support to remove the record for you.