I've tried at both the menu and article level, but I can't seem to hide the date, last updated and hits in articles, for example:
www.opensm.org/en/meet-the-alliance/the-alliance

Dear Claudio12,

I updated this file: templates/sj_agenz/html/com_content/article/default.php
and find:
<?php echo JLayoutHelper::render('joomla.content.info_block.publish_date', array('item' => $this->item, 'params' => $params, 'position' => 'above')); ?>
Edit to:
<?php if ($params->get('show_publish_date', 1)) echo JLayoutHelper::render('joomla.content.info_block.publish_date', array('item' => $this->item, 'params' => $params, 'position' => 'above')); ?>

and find:
<?php echo JLayoutHelper::render('joomla.content.info_block.modify_date', array('item' => $this->item, 'params' => $params, 'position' => 'above')); ?>
Edit to:
<?php if ($params->get('show_modify_date', 1)) echo JLayoutHelper::render('joomla.content.info_block.modify_date', array('item' => $this->item, 'params' => $params, 'position' => 'above')); ?>

and find:
<?php echo JLayoutHelper::render('joomla.content.info_block.hits', array('item' => $this->item, 'params' => $params, 'position' => 'above')); ?>
Edit to:
<?php if ($params->get('show_hits', 1)) echo JLayoutHelper::render('joomla.content.info_block.hits', array('item' => $this->item, 'params' => $params, 'position' => 'above')); ?>

Thanks

Thanks for collaboration,
Claudio

Dear Claudio12,

Please feel free to contact us if you need any assistance.

Have a nice day!