A. To stop comments on all future posts (or pages):
Step 1: Login to the WordPress admin dashboard
Step 2: Navigate to Settings > Discussion in your WordPress Dashboard.
Step 3: Uncheck the option “allow people to post comments on articles” and this option will stop comments entirely on all future posts on your site.
B. To stop all comments on all published posts (or pages):
Step 1: Login to the WordPress admin dashboard
Step 2: Now move to ‘Comments’ section
Step 3: Now you can select the comments you want gone, click Bulk Actions, select “Move to Trash”, and then click the Apply button.
C. To stop comments on selected posts (or pages) in bulk:
Step 1: Login to the WordPress admin dashboard
Step 2: Go to all Posts section and select all the posts for which you wish to delete comments.
Step 3: Then click on Bulk Actions > Edit > Apply.
Step 4: A new option Bulk Edit will open up where you can choose the ‘Do Not Allow option for comments’.
Step 5: To stop comments on existing posts individually.