您可以尝试以下代码：

function remove_default_image_sizes( $sizes ) {

  /* Default WordPress */
  unset( $sizes[ 'thumbnail' ]);       // Remove Thumbnail (150 x 150 hard cropped)
  unset( $sizes[ 'medium' ]);          // Remove Medium resolution (300 x 300 max height 300px)
  unset( $sizes[ 'medium_large' ]);    // Remove Medium Large (added in WP 4.4) resolution (768 x 0 infinite height)
  unset( $sizes[ 'large' ]);           // Remove Large resolution (1024 x 1024 max height 1024px)

  /* With WooCommerce */
  unset( $sizes[ 'shop_thumbnail' ]);  // Remove Shop thumbnail (180 x 180 hard cropped)
  unset( $sizes[ 'shop_catalog' ]);    // Remove Shop catalog (300 x 300 hard cropped)
  unset( $sizes[ 'shop_single' ]);     // Shop single (600 x 600 hard cropped)

  return $sizes;
}

add_filter( 'intermediate_image_sizes_advanced', 'remove_default_image_sizes' );

据我所知（不确定是否有任何变化），你不能，图像大小创建时，你通过新媒体添加它们，但我离开的人更好地了解。

您可以尝试一些变通方法，如下面的一个测试和工作，但没有检查冲突：

// theme image size
add_image_size( '1280', 1280, 9999 );

function mlnc_remove_add_image_sizes() {
    // remove theme image size
    remove_image_size( '1280' );
    // add product image size
    add_image_size('1165', 1165, true );
}
if ( get_post_type( $_REQUEST['post_id'] ) === 'product' ) { 
  add_action('init', 'mlnc_remove_add_image_sizes');
}

这是基本的想法。。

试试这个：

add_action( 'init', 'custom_remove_image_sizes' );
function custom_remove_image_sizes() {
    remove_image_size( '1536x1536' );
    remove_image_size( '2048x2048' );
    remove_image_size( 'medium_large' );
    remove_image_size( 'woocommerce_gallery_thumbnail' );
    remove_image_size( 'woocommerce_single' );
    remove_image_size( 'woocommerce_thumbnail' );
}