@cybersnaby: First the Header Title and Description optional at the text that will be added in header just below the menu. But the page title will be added in the content section. So, these are different. For example, if you see it in the demo about page http://catchthemes.com/demo/catch-mustang/about/, you can see the difference.
There is not option to disable the page title, you can empty the page title in your page and it will not display it.