Hi Mike,
I didn’t notice that there are two input areas in Design>Editor which need to be toggled. By mistake I tried to copy the code into style.css. No errors when I copy it into functions.php. Sorry for my stupidity!
However, using the code didn’t solve my initial problem!
Maybe it’s the wrong code for my purpose?
What I want to do:
I would like my potential clients to get in touch with me and send me an Email-Message to my business Email address by using the Contact Form. And I need to see who sent me the Email to be able to respond.
What I did and what happened:
Put my business Email address in the first input field of the form in Enfold as the target for the clients Emails.
Wrote a test message on my web page as a dummy client, using my private AOL Email address as an input into the field “E-Mail”
Got an error message from the host of my business domain – and my business email-, that due to AOL’s DMARC policy they are not allowed to forward the Email because the AOL address has be changed to webmaster@my_business_domain. The error message is being sent sometimes, hoever with most trials nothing happens at all.
Tried the code

add_filter(‘avf_form_from’, ‘avf_form_from_mod’, 10, 3);
function avf_form_from_mod($from, $new_post, $form_params) {
$from = “(Email address hidden if logged out) “;
return $from;
}

and replaced (Email address hidden if logged out) with my business Email address. No Message went through to my business inbox.
Is the code the right one to achieve what I want to achieve or what else to use?
Best regards
Thorsten

I found out that I have to enable the GeoCoding service API as well, now it works.
Issue closed.
Kriesi may add that to the list of troubleshooting on the respective Google Services Page in Enfold.