Not clear how you are getting such results.  I just ran the stock docbook-xsl-ns-1.79.1 docbook.xsl stylesheet, and the chapter title is 24.88 pt and the level 1 section title is 20.74 pt. I use Acrobat Pro's Touchup Text Tool and selecting Properties to view the font size of a sample in the PDF.

Customization of titles for print is covered in this section of my book:

http://www.sagehill.net/docbookxsl/TitleFontSizes.html

Bob Stayton
Sagehill Enterprises
[email protected]

On 12/19/2018 3:02 AM, Bernhard Kleine wrote:
Without changing anything to do with chapter and section titles the
chapter titles in the pdf turns out to be smaller than the section
titles. What parameters do I have to change and where?

Regards

Bernhard

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