Conversion to v12 Pro worked fine EXCEPT for... 
Autor: James Becker
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I've converted http://cofchristknoxville.org to ver 12 Pro and all is almost well. It passes the Google Mobile Friendly test. However when viewed on a mobile phone the "Header" does not adjust. What am I missing here?
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Hello James,
you need modify the template for the mobile version.
Click on the step 1 and in the mobile template, then modify the heder. You can add a new small image for the mobile header.
Hope this help.