I'm not familiar with kaobook and its supporting files.
My code are follows:
\documentclass[
fontsize=10pt,
twoside=true,
open=any,
chapterentrydots=true,
numbers=noenddot
]{kaobook}
\usepackage{lipsum}
\begin{document}
\fontsize{8.5}{8.5}\selectfont
\lipsum[1-9]
\end{document}
In PDF, the font size was displayed as 8.21,
how can I achieve the given font size?
