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  • So basically it’s a WordPress hook (not ACF hook), reference:

    Top level pages	admin.php?page={page_slug}	toplevel_page_{page_slug}
    Sub pages	admin.php?page={page_slug}	{parent_slug}_page_{page_slug}

    Thank you @hube2 for this ! 🙂

    reference says it is using slugs, and your final code does not corresponde with your initial code, so I just don’t believe it started using titles, that would be horrible approach.