Sorry to bother you again.
It seems that the current \font_scale_defined can only modify the font size of
a b c d, etc.,
and it seems that the font size of x cannot be modified.
I don't know if this is a bug or my operation problem.
Here is a simple example.
%%%%%
\usebodyfont[pagella]
\setupbodyfont[modern]
\setuppapersize[B6]
\starttext
{\rmx Latin Modern \switchtobodyfont[pagella]TeX Gyre Pagella \rmx TeX Gyre
Pagella}
\footnote{\rmx Latin Modern \switchtobodyfont[pagella]TeX Gyre Pagella \rmx TeX
Gyre Pagella}
{\rma Latin Modern \setupbodyfont[pagella]TeX Gyre Pagella \rma TeX Gyre
Pagella}
\footnote{\rma Latin Modern \setupbodyfont[pagella]TeX Gyre Pagella \rma TeX
Gyre Pagella}
\stoptext
%%%%%
autumnus
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