/wp-admin/options.php medium_large_size_w function dco_remove_default_image_sizes( $sizes) { return array_diff( $sizes, array( 'thumbnail', 'medium', 'medium_large', 'large', ) ); } add_filter('intermediate_image_sizes', 'dco_remove_default_image_sizes'); add_action('after_setup_theme', function() { echo '
'; print_r(wp_get_additional_image_sizes()); echo ''; die(); }, 999); function dco_remove_default_image_sizes( $sizes) { return array_diff( $sizes, array( 'thumbnail', 'medium', 'medium_large', 'large', ) ); } add_filter('intermediate_image_sizes', 'dco_remove_default_image_sizes');