Out-of-the-box, once users add their comments to a Knowledge Document, all Comments are displayed under 'Comments' section of the document as shown below. You may prefer to hide them from public view. 

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How to hide comments displayed under 'Comments' section of the Knowledge Document? 

Release: SDMU0M99000-14.1-Service Desk Manager-Full License
Component:

In order to hide all Comments displayed under Comments section of the Knowledge Document, please follow the below steps.

1. Log into Service Desk Manager (SDM) using a SDM privilege account and open 'Administration' tab.
   
   
2. Go to 'Knowledge' > 'Documents' > 'Document Settings'.
   
   

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3. Select "Allow comment submission but not comment viewing" and click <Save> to save the change.
   
   

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If you change the setting to "... not comment viewing", the Comments can be seen on 'Comments and Notification' > 'Comments' tab of the Knowledge Document opened in admin mode. 

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Configure Knowledge Management Settings > Specify Document Settings