For making a two-column document, we need to add an option in the document class in the input file \documentclass [ 14pt ,a4paper,twocolumn, landscape ]{ arabart } I propose the following code that generate the document showed in the picture above: \documentclass [ 14pt ,a4paper,twocolumn,landscape]{ arabart } %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%% importants packages %%%%%%%%%%%%%%%%%%%%%% \usepackage [top=0. 5cm , bottom=1. 5cm , left= 1cm , right= 1cm ]{geometry} \usepackage [utf8]{inputenc} \usepackage [ LAE ]{fontenc} \usepackage [ arabic ]{babel} \usepackage {multicol} \usepackage { multirow } \usepackage {tabularx} \usepackage {amssymb} \usepackage {array} \usepackage {graphicx} %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%% new command %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% \newcommand { \dis }{ \displaystyle } \mathchardef\times="2202 \newcommand { \C }{ \mathbb {C}}