How to remove the featured image of Divi Extra theme posts

 By default, the posts on Extra display a large featured image. On small screens, this can take up most of the screen and there was previously a simple way to remove this image. It seems Elegant Themes have removed the functionality to easily remove this. 

Please, go to your WordPress Dashboard > Divi > Theme Options > Custom CSS and add the following:

.single-post .post-thumbnail {

    display: none;

}