@WisdmLabs is right. For old images you will have to use that plugin to regenerate thumbnails. For new images which you will upload it will respect the 600 height mentioned in child theme’s functions.php file.
@WisdmLabs is right. For old images you will have to use that plugin to regenerate thumbnails. For new images which you will upload it will respect the 600 height mentioned in child theme’s functions.php file.