If you would like to disable / turn off WordPress comments on your posts and pages here is how you do it.
In wp-admin go to Settings > Discussion and then untick “Allow people to post comments on new articles”, as shown below. This applies to any new posts and pages that you publish from now on.
To disable / turn off WordPress comments from posts that you have already published:
In wp-admin go to Posts, select all the posts, in the Bulk Actions box select Edit and then click Apply. Select ‘Do not allow’ next to Comments and then click the Update button.
If you want to just disable comments on pages and leave them active on posts you will need to keep the ”Allow people to post comments on new articles” ticked in the settings and on every page, existing and new untick ‘Allow comments’ in the Discussions section.
John Wilkinson
Build Me A Website