Tsfe::includeHiddenRecords() 

\nn\t3::Tsfe()->includeHiddenRecords($includeHidden = false, $includeStartEnd = false, $includeDeleted = false); 

Get hidden content elements in the frontend. Can be used before rendering.

\nn\t3::Tsfe()->includeHiddenRecords(true, true, true);
$html = \nn\t3::Content()->render(123);
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@param bool $includeHidden
@param bool $includeStartEnd
@param bool $includeDeleted
@return void

Source Code 

public function includeHiddenRecords($includeHidden = false, $includeStartEnd = false, $includeDeleted = false)
{
	$context = GeneralUtility::makeInstance(Context::class);
	$current = $context->getAspect('visibility');
	$includeHidden		= $includeHidden || (method_exists($current, 'includesHiddenPages') ? $current->includesHiddenPages() : false);
	$includeDeleted		= $includeDeleted || (method_exists($current, 'includesDeletedRecords') ? $current->includesDeletedRecords() : false);
	$includeStartEnd	= $includeStartEnd || (method_exists($current, 'includesStartEndRecords') ? $current->includesStartEndRecords() : false);
	$context->setAspect(
		'visibility',
		GeneralUtility::makeInstance(
			VisibilityAspect::class,
			$includeHidden,		// pages
			$includeHidden,		// tt_content
			$includeDeleted,
			$includeStartEnd
		)
	);
}
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