In your Blogger dashboard go to settings >> posts and comments and you will have overall comment settings for Blogger.
Comment location you will have four options:
Embedded: This is the default option that appears in all your pages. This options sets comment box below the content.
Full page: In each posts this option will sets a link below which says “post a comment”. This link takes visitors to a separate page to make their comments.
Popup window: In this option user will be making their comments on popup window.
Hide: This is the option that you needed. By enabling this users cannot make comments on any pages. But existing comments still show up.
Also you can set who can comment? And enable comment moderation as well.