For disable comments on all posts on your WordPress sitefollow the following steps:
Step 1: In the WordPress back office, go to “Settings”, then to “Discussion”.
Step 2: in the window that opens, uncheck the box “Allow readers to post comments on new articles. ». From now on, visitors can no longer leave comments on new articles – but can still comment on old ones. So don't miss the next step.
Step 3: check the box “Automatically close comments for articles older than [14] days « . Change the number of days, often set to “14” by default, to “0”. Concretely, even existing comments are now deactivated and are no longer visible. To activate all of these changes, click the “Save Changes” button at the bottom of the page.
