# Constant margins in book class

I use the book document class and I have margins set like this:

\usepackage[top = 1.2cm, bottom = 1.2cm, left = 2cm, right = 1cm]{geometry}

But the left and right margin switch depending on that is the page number even or odd. For example, on the page 1 the left margin is 2cm and the right margin is 1cm, on the page 2 the left margin is 1cm and the right margin is 2cm. How can I disable this, so that on the all pages the left margin is 2cm and the right margin is 1cm?

• Use the oneside option for the document class (\documentclass[oneside]{book}). – Phelype Oleinik May 21 '18 at 15:48
• Try to pass the option oneside to the book class, it should prevent this behaviour from happening. – RockyRock May 21 '18 at 15:49
• But do you intend to print one-sided? – Bernard May 21 '18 at 17:28
• @Bernard No, I don't. I just wanted to know how to do it. It may come in handy one day. – Hanlon May 22 '18 at 10:26

The oneside option for the book class allows you to do what you want:

\documentclass[12pt, oneside]{book}
\usepackage[top = 1.2cm, bottom = 1.2cm, left = 2cm, right = 1cm]{geometry}
\usepackage{blindtext}

\begin{document}

\chapter{1}
\blindtext[5]
\chapter{2}
\blindtext[5]
\chapter{3}
\blindtext[5]

\end{document}


Romain