Hello @margery,
The feature to disable the header bars for individual sub pages is not available in the theme and as much as we would like to help you we are not able to as, the theme doesn’t support this customization and this is beyond the support offered for our products, which consists of bug fixing and theme documentation.
Although it is possible for you to achieve your request on the theme with advanced code customization of the theme, it might effect other parts of the theme, like its design and at times its functionality.
It would be wise not to customize the code yourself if you do not have knowledge on programming,
Our suggestion to you is to hire a professional developer for your customization, so that your theme will no be effected in any way.
To hire a developer please follow the link below
http://themepalace.com/hire-a-customizer/
We hope it helps,
Best Regards.