The first group of fields on the comment configuration page, Comment Viewing Options, controls how comments are presented on your site.
Default display mode: This determines how comments appear on the page. Comments can be flat or threaded, expanded or collapsed. The comments on Drupal.org are threaded and expanded.
Default display order: This determines whether comments are displayed in chronological or reverse chronological order. While this is mostly a matter of personal preference, you should consider that threaded comment listings work better in chronological order.
Default comments per page: This is the number of comments that will be displayed before pagination kicks in.
Comment controls: If you want your users to choose for themselves how comments should be displayed, this field should be set to display the comment controls above and/or below the comments. If you feel that this clutters the page and presents the user with too many options, you can disable the personalized comment controls.
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