How to disable comments

You can disable comments on the front-end settings page.

Go to Customization > Styling and Front-end Settings.

Select the "Article" tab. There you can find the options for comments. For example by disabling the "Show Comments" option you will remove comments completely. If you disable the "Allow Comment Posting" instead, you simply disallow posting of new comments, but all existing comments and comments that Staff users create will be shown.

Remember to press "Save" to save the new settings.