How to make part of theme visible only to registered users

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Use this code in the theme files:

<?php if(!$this->auth->connected):?>
 
Register to View This Content
 
<?php else:?>
 
Content shown to registered users
 
<?php endif;?>

If you need to make content visible to a specific user group(s), you can use the code below:

<?php if ( $this->auth->belongsToGroups([1,2,3]) ) :?>
 
This user belongs to groups 1, 2 or 3
 
<?php endif;?>