[Theme Horse Support Team]

Hi javierlopez,

If you want to disable only certain page / post then go to particular page / post which you want to disable.
Click on screen options at right top of the page /post

Select the Discussion and comments so that it will display below the editor. You will be able to see like this.
view screenshot

http://awesomescreenshot.com/00330i7i64

Unselect both of them and it will not display the comment section.

Thank you!