How to set/limit number of comments to display per post?

Hook this function to set number of comments to retrieve:

//limit comment
 function limit_comments($query) {
    $query->query_vars['number'] = 5; //set the number of comments
    $query->query_vars['paged'] = 1;
  }

  add_action('pre_get_comments', 'limit_comments');

Where Do I Put This Code?

This code should be placed in the functions.php file of your active theme or a custom functions plugin.

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