How Open the [file_list] documents in new tab ?

Hello @rno,
Hope you are well.
Please add the following code before the </body> in footer.php in your theme directory.

<script>
jQuery(function($){
    $('.inddl.btn').each(function(){
         $(this).attr('target','_blank');
    });
});
</script>

I hope it will solve your issue.
With Regards

Hello @rno,
In that case you can use this plugin or you can contact with your theme support about implementing that custom code.
Thank you.

Hi @rno,
In that case, provide us with your temporary wp-admin login details and admin URL in a private reply for checking the issue.
Also, please share the related page/file/package URL with us where the issue exists.
Thank you