If the Automatic Lead Matching Add-On is active on the site the admin will be able to create custom lead actions.
When leads are submitted through a lead form that is not associated with a specific member (from the /getmatched page of the site for example), all "Lead Submitted" notifications will be controlled by the Main Action.
If there are any additional custom actions added, the Lead Submitted notifications set for those actions will only apply to direct leads submitted to the members in Membership Plans affected by this action, which is set in the General Settings tab of the custom action: