I found the answer (well I paid for it) so I am sharing it here.
This code only display the title and featured image for a chosen category and sub-categories.
I made a child theme and created a new content.php file. Then I used the following code. Look for //Here use the id of the category then add your own category ID (replace 14).
Sorry I don't know how to enter code properly on this site.
" >
', '' );
else :
the_title( sprintf( '', esc_url( get_permalink() ) ), '' );
endif;
?>
$category_id )
);
$array_cats=array();
foreach($categories as $cat){
$array_cats[]=$cat->term_id;
}
$array_cats[]=$category_id;
if(!has_category($array_cats)){
?>
', '', false )
) );
wp_link_pages( array(
'before' => '' . __( 'Pages:', 'twentyfifteen' ) . '',
'after' => '',
'link_before' => '',
'link_after' => '',
'pagelink' => '' . __( 'Page', 'twentyfifteen' ) . ' %',
'separator' => ', ',
) );
?>
', '', false )
) );
wp_link_pages( array(
'before' => '' . __( 'Pages:', 'twentyfifteen' ) . '',
'after' => '',
'link_before' => '',
'link_after' => '',
'pagelink' => '' . __( 'Page', 'twentyfifteen' ) . ' %',
'separator' => ', ',
) );
?>
', '' ); ?>