Page Layout ⇒ Setting page margins by use of texinfo.tex

[Budi]

How do we set page margins by use of texinfo.tex or texinfo.cnf ?

There's a .texi file with the output PDF page margins is too wide.
How could we adjust it using latex/Tex command as texi help refer that configuration is in texinfo.tex or texinfo.cnf ?
GNU texinfo:https://www.gnu.org/software/texinfo/ma ... sizes.html

it's usually in /usr/share/texmf/tex/texinfo/texinfo.tex
Thanks much before