We do not have an explicit way to reset the led score to zero from the interface. However, as a workaround, users can export the leads, delete them in the CRM and re-import the list back into Freshsales. Before performing this action, the user will have to disable the enable intelligent lead scoring option under Admin Settings > CRM Settings > AUTOMATION SETTINGS

When this action is performed, conversations, tasks and appointments pertaining to the leads will also be removed.