I've tried to get the math scaling right in a number of different ways, but have failed. What is the proper syntax here? The posting unicode math font smaller than the text seems relevant, but that didn't work.
% !TeX program = lualatex
\documentclass{article}
\usepackage[no-math]{fontspec}
\usepackage{unicode-math}
\usepackage{lipsum}
\setmainfont{Baskervaldx-Reg}[Scale=0.2]
\setmathfont{Baskervaldx-Reg}[Scale=0.2]
\begin{document}
\lipsum
$x=y$
\lipsum
\end{document}
unicode-math