This question is in reference to Atlassian Documentation: Advanced PDF Export Customizations
Why do these setting are not applied when exporting a single page?
When exporting via space content tools, it works.
When exporting from the page's tool menu, it does not.
Look at this page: Customize Exports to PDF
"PDF customization only applies to space exports (not single page exports via Tools > Export to PDF)"
So you won't be able to use it for single pages.
There is a great plugin though, which provides a powerful PDF customization for single pages (and its child pages if you want to):
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