FWD2016 replied
Thanks for the quick reply :)
Yes, when I saw Penci add the feature as mentioned in your "but" entry of your post, I did that a couple of updates before. I moved my Google AdSense script to the Customizer Logo & Header module and removed the same script from the head.php file in my Child-Theme folder.
What I did not do (late in doing) was remove the head.php file from my Child-Theme folder since it was not needed.
I guess your reply helped me catch up to some late cleanup. I now deleted the head.php file from my child theme and now the mobile menu - close works. ~ Thanks.
This ticket is now resolved :)