\documentclass{article}
\usepackage[
a4paper,
top=1cm,
bottom=1cm,
left=1cm,
right=1cm,
nohead,
nofoot,
showframe,
]{geometry}
\begin{document}
~
\end{document}
\documentclass{article}
\usepackage[
a4paper,
top=1cm,
bottom=1cm,
left=10cm,
right=1cm,
nohead,
nofoot,
showframe,
]{geometry}
\begin{document}
~
\end{document}