How to remove featured image form post page?

When I click on a post, the feature image is on top the page and its huge and I’d like to get rid of it without removing a featured image. Any ideas?

The main idea of this theme is to put images first this is why featured images are on top of the each post. However, you can easily remove them from Post pages by editing single.php file.
You can access it via WordPress dashboard → Appearance → Editor.

Fine the line that says

< ?php the_post_thumbnail( 'detail-image' ); ?>
and remove it entirely.

It will do the trick.