Users don’t get an email when their password is reset, maybe you mean the admin email? If so, then this email is sent by WordPress to notify the admin, it’s not customizable in HivePress/Emails.
The link you sent allows me to disable the admin email notifications. I already use the wordpress plugin Manage Notification E-Mails to disable several of the admin emails.
But I found a different snippet I could add to my functions.php file for the user notification email: