Hide header featured image?

In the Parallax Pro theme, a page and/or post’s featured image displays as the entire header image. I’m good with this on the regular pages of the site. Is there a way to NOT do this on single posts? For example a user adds an image to their post, the image shows as a thumbnail in the list of posts, but then when you go to that single post, you have the post thumbnail and post text with a portion of the thumbnail image stretched (parallax effect) across the top as a banner size header image. Is there something in the settings that I’m missing with this that I need to change? Or how can I just NOT show the header-featured-image on posts? Also, I'm updating the site and testing this in my local test environment, otherwise I'd share the url. Any help or guidance you can provide would be appreciated. Best Regards, Janet