This code is to output the contents of the Before </ Head> field, which is located in the template setting. Just check the contents of this field instead of commenting code.
do you mean the CUSTOM CODE tab? If yes, it is empty. scrrenshot https://humandesignart.ru/images/form2.jpg
In my opinion it is better to use CONTACTUS (PRO) than Form Builder. At least in the articles. This module is quite reliable and has a number of advantages in the settings. (IMO)
On the one side, yes, on the other side, Contactus does not have the options that FormBuilder has. (pattern for checking the phone, sending a duplicate letter to the sender, and others) and i want to use FormBuilder