Enable and Disable Comments for Published Posts and Pages
You can enable/disable comments on a post you’ve already published by going into your post’s More Options.
1. Open an existing post.
2. Open More Options and check/uncheck “Allow Comments.”
Click on the “Update” button and you’re done!
Enable/Disable Comments for a Group of Posts or Pages
If you would like enable/disable commenting for a group of posts or pages, go to your WP Admin → Posts and follow the directions for Bulk Editing.
Looking to change comment settings on future pages or posts? Check out the guide.