Maybe you have seen this question before, but I still cannot find a solution after I have upgraded Magento to 22.214.171.124. Can some one explain the solution 3 in this link? https://community.magento.com/t5/Security-Patches/SUPEE-8788-Solutions-to-Different-Problems/td-p/52572
and in main template that following is not overwritten by another theme.
Where is main template?