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A paragraph entity references a media image field, and it needs to change its display options in code.

How can I achieve this?

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One option is to alter the build array using entity_view. You could then add conditional code there, to change image display settings.

/**
 * Implements hook_entity_view().
 *
 */
function mymodule_entity_view(array &$build, EntityInterface $entity, EntityViewDisplayInterface $display, $view_mode) {
  if ($entity->getEntityType()->id() == 'paragraph' && $entity->bundle() == 'my_paragraph_type') {
    if (!empty($build['field_image'][0])) {
      // $build['field_image'] = 
       // make changes to your image field here
    }
}

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