The blog cover is not recommended to be removed for SEO purpose because, if for instance you add my SEO fix, it helps with SEO structure. I would instead recommend user the same cover as the post image instead of adding a extra one. However if you still want to remove, look for img inside the blogs.tpl file make sure to remove in the correct section.
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WOWonder and Sngine discussion forums
Blog posts
Hello!
Anytime I create a blog post and upload a cover for it, the image used as cover also integrates as part of the post so if I insert another media inside the post in the final post I get two images: the post's cover and the image I uploaded as content. Is there any way to stop automatically insert the post's cover as content and only show it as the blog's preview? (like the image below)