Hide price field for specific view mode.

*.module

/**
 * Implements hook_ENTITY_TYPE_view_alter() for 'commerce_product' entities.
 */
function swimsports_commerce_commerce_product_view_alter(array &$build, EntityInterface $node, EntityViewDisplayInterface $display) {
  // Hide price field. For some reason we cannot configure price visibility 
  // from UI.
  if ($build['#view_mode'] === 'add_to_cart_confirmation_view') {
    $build['variation_price']['#access'] = FALSE;
  }
}