Disable Comments is a way in which the moderator can bar any user from commenting on any idea. It is the moderators privilege to decide if commenting should be allowed / disallowed on an idea . By default comments are allowed on an idea however the moderator, from the front end can disable comments on an idea. A standard user will not see "Comment" tab on the idea page.
HOW TO DISABLE COMMENTS
1. Click on the "Moderate Idea" button on the top right corner of the idea for which comments are to be disabled.
2. Click on the "Disable Commenting" button .
A message flashed at the top of the screen confirms that commenting has been disabled.