How to Enable/ Disable Comments At Once WordPress

Find Posts --> All Posts

1.  Login to your WordPress Admin dashboard.
2. Find Posts --> All Posts
3. Click on the checkbox on header ( In Just Right Panel) that is --> Title
4. Choose Edit under the Bulk Action drop-down and then click APPLY . The bulk edit area will appear (See below Image)

   

   Edit under the Bulk Action drop-dow

5. Select the categories  for which you want to enable / disable comments, status, format and others. 
6.   Choose the proper action from drop-down ( Bottom right in above image)
7. Click the UPDATE button on the far right
8. That’s all you have to do.