Hi there,
would require a bit of code and a header element. Give this a shot.
1. Add this PHP snippet to your site:
function db_feat_img_shortcode() {
$img_src = wp_get_attachment_image_src( get_post_thumbnail_id( $post->ID ), 'large', false );
return '<img src="' . $img_src[0] . '"/>';
}
add_shortcode( 'db_feat_img', 'db_feat_img_shortcode' );
https://docs.generatepress.com/article/adding-php/
This will create a new shortcode called [db_feat_img]
for displaying the featured image.
2. Create a new Header Element:
https://docs.generatepress.com/article/header-element-overview/
Then add this to the content:
{{post_title}}
[db_feat_img]
And set the Display Rules to Posts > All Posts
This should place the Title and the featured image above the post content / sidebar.