Thank you for answering.
We are talking about two different things. You mean the font size and I the font/type.
I'm reading my books with the font/type "Keep calm" and it would be cool if there were a possibility to chose this font/type also for the Alt Status Bar and Status Bar. Then all have the same look, the letters in the book and the letters in Alt Status bar and Status Bar. Now this is different and there is no option, to chose any other font/type.
That's the font I'm using:
https://www.dafont.com/de/search.php?q=keep+calm
and would be nice to have it also for the Alt Status Bar and Status Bar.