If you want to stop users from being able to leave comments on your Help Center Content, including Guide Pages, Knowledgebase Articles, News Posts, Community Topics, and Files, you can disable the feature using Usergroup Permissions.

Go to Admin > CRM > Usergroups. To disable commenting you will need to update the Permissions for the two built-in Permission Groups.

First, go to the Everyone Usergroup, from here select the Permissions tab, and Help Center then for the specific items you want to disable the commenting for, toggle off the permission for Submit comments on X and hit Save.

Once you have completed this, the Help Center items you have disabled commenting on will no longer offer the option to comment for any Registered or Guest users.