function remove_image_size__95344($possible_sizes) {

 unset( $possible_sizes['small-wide-cropped']);
 unset( $possible_sizes['small-square-cropped']);
 unset( $possible_sizes['billboard-cropped']);
 unset( $possible_sizes['tiny-wide-cropped']);
 unset( $possible_sizes['tiny-square-cropped']);
 unset( $possible_sizes['smaller-wide-cropped']);


 return $possible_sizes;

}
add_filter('image_size_names_choose', 'remove_image_size__95344');