Hello Faizan,
Thanks for writing in!
If you would like to make the changes in theme files then, please copy _landmark-header.php from /wp-content/themes/x/framework/legacy/cranium/headers/views/renew/ to /wp-content/themes/x-child/framework/legacy/cranium/headers/views/renew/. You will have to create necessary child folder.
You can also remove/hide the title using Custom CSS. Please add following CSS under X > Theme Options > CSS:
.single-product .x-landmark {
display: none;
}
1- I have found the proper CSS code selector using the Chrome browser Developer Toolbar: https://www.youtube.com/watch?v=wcFnnxfA70g
2- For the CSS code itself, I suggest that you get started with this tutorial: https://www.youtube.com/watch?v=yfoY53QXEnI
Thanks.