Sms code and Captcha verification?

Sms code and Captcha verification?

Where I can set the length of the code you sent by sms?
  8 to 6 digits.
 
Where I can disable the second captcha validation of SMS metod?
the function as the webadmin of  >> settings policy >> advanced >> General >> hide captcha does not work.
 
Athach image.
 
Thacks!!!
 

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