Headers in capital letters

[Jürgen Spitzmüller]

Am Samstag, dem 20.03.2021 um 16:43 +0100 schrieb Andreas Plihal:
> The headers of the introduction and the index are set in two-register
> font, the headers of the chapters, however, only (suddenly) in
> capital letters.

You put

\usepackage{fancyhdr}

in your preamble. Remove that!

Jürgen

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