1. Does it work the same way with the parent theme?
Have you tried to disable all 3rd-party plugins?
2. You can change products image size via Customizer > Woocommerce > Product Images + don’t forget to regenerate thumbnails after changes.
3. – Please check our demo http://prntscr.com/javfim “Show Product Title” can be disabled in Theme Options > Single Product Page
Please read this topic https://www.8theme.com/topic/woocommerce-main-product-image-size-not-resizing-after-3-3-update/
4. Please create an empty dynamic.css file in woopress-child theme folder and set permissions 777 for the file + add wp_enqueue_style( 'dynamic-css', get_stylesheet_directory_uri() . '/dynamic.css' ); in woopress-child/functions.php file. Then go to Theme Options and re-save them.
