tyfdesign

When activated, this plugin: 
1. Closes comments and pings on all existing public content (posts, pages, and custom post types). 
2. Sets WordPress defaults to disallow new comments and pings on all future content. 
3. Ensures that newly created or updated posts remain closed to comments. 
4. Hides the default Comments menu in the admin sidebar when enabled. 
5. Provides a simple Settings page with a single Activate / Deactivate button to toggle behavior.
When deactivated, the plugin restores the default WordPress discussion settings without reopening previously closed comments.
Created by TYF Design.

Do Not Allow Comments Everywhere

A lightweight plugin that globally disables comments and pings across all WordPress content - past and future.

CRUDLab

CRUDLab Disable Comments plugin allows you to disable comments for any page or post or for whole site. You can disable comments for any particular page or post temporarily or on permanent basis.
<h4>Features</h4>
<ul>
<li>Disable comments on all pages</li>
<li>Disable comments on all posts</li>
<li>Disable comments on particular page or post</li>
<li>Disable comments everywhere temporarily </li>
<li>Disable comments permanently. (This action can’t be undone)</li>
</ul>

CRUDLab Disable Comments

CRUDLab Disable Comments plugin allows you to disable comments for any page or post or for whole site.

Do Not Allow Comments Everywhere vs CRUDLab Disable Comments