It would be great if PDF space export provide a feature to hide the page titles.

Hiding the parent page titles is achievable by using the following code on the PDF stylesheet

h1 {display:none;} 

In order to hide children page title in the exported PDF, I try the following code which is successful. However, it turns out that Confluence also hide the heading 1 of parent page

h2 {display:none;}

Trying some workaround with no success.