Here’s a quick tip for hiding the featured image on a post within the Extra Theme.
There is a built-in option for it, but it can be easy to miss. When editing a post, you’ll should have the following box in the sidebar of your post editor screen:
Simply tick the “Hide Featured Image on Post” box (highlighted in orange above) and when you save / view the post, the featured image will be removed from the post page itself.
Note that, if your post has a featured image selected, the image will still be displayed on the homepage, category pages, etc, when the post is listed there.
Please see this post if you’d like to easily hide the featured image on all posts.