Fewer characters for user password after registration

Hi, I have a question regarding to user registration: When a user get register, receives an email with username and password, but this password is generating automatically by the system and is too long (strong) like this one: f4e19968db89fa40bda8a8286017d506, it is possible to make the password with fewer characters? can I change it from payplans config or joomla admin panel?

Is for the same site you work in the ticket previousley.

Thanks