I am using Civirm 5.1 on Joomla and using the GDPR extension to update Communication preferences. The org has only 1 public facing group with just 1 Mailing list - and the entire purpose of the communication is to ask people if they wish to sign up. If they do not repond they will be removed from Group and if they do respond it is ONLY for the purpose of asking to receive newsletter. Therefore, we need to make the Mailing Group compulsory to sign (as opposed to optional). We do not want form used if you do not want newsletter.
see form here
1 tick box option to MS Newsletter - any ideas how to make compulsory in settings?