I want to set full page instead of using two columns?

Question

I am writing a solution manual which I have already completed. I want the normal page to write the preface, acknowledgement and dedication just as the page on which contents are written without splitting into columns. I do not know how to set the page normally to write the preface. I am providing full files with all codes.
documentclass[10pt]{book}
usepackage[paperheight=9in,paperwidth=7in, top=1in, bottom=0.8in, twocolumn, twoside]{geometry}
setlength{columnseprule}{0.4pt}
usepackage{amssymb}
usepackage{mathrsfs}
usepackage[centertags]{amsmath}
usepackage{amsthm}
newtheorem{theorem}{Theorem}
usepackage{epsfig}
usepackage{graphicx}graphicspath{{Graphics/}}
usepackage{amsthm}
usepackage{mathptmx}
usepackage[square,sort&compress]{natbib}
usepackage{pgf,tikz,pgfplots}
pgfplotsset{compat=1.15}
usetikzlibrary{arrows}
usepackage[T1]{fontenc}
usepackage{fancyhdr}pagestyle{fancy}
usepackage{xcolor}
usepackage{setspace}
usepackage{booktabs}
%usepackage{hyperref}
usetikzlibrary{arrows.meta}
renewcommand{baselinestretch}{1.5}
newcommandaug{fboxsep=-fboxrule!!!fbox{strut}!!!}
theoremstyle{definition}
newtheorem{Thm}{Theorem}[section]
newtheorem{lem}[Thm]{Lemma}
newtheorem{pro}[Thm]{Proposition}
newtheorem{de}[Thm]{Definition}
newtheorem{re}[Thm]{Remark}
newtheorem{ex}[Thm]{Example}
newtheorem{cor}[Thm]{Corollary}
numberwithin{equation}{section}
definecolor{uuuuuu}{rgb}{0.26666666666666666,0.26666666666666666,0.26666666666666666}
begin{document}
%include{Frontmatter/colophon}
tableofcontents
%Mainmatter
include{Mainmatter/Chapter-1}
end{document}

I need the preface page like the contents page without splitting into two columns. I need two columns geometry just after the contents table. How can I set this.

Peter Wilson · Answer

Put onecolumn when you want one column and twocolumn when you want two columns
% onetwocolprob2.tex  SE 555696
documentclass[10pt]{book}

usepackage{lipsum}   %%% added

usepackage[paperheight=9in,paperwidth=7in, top=1in, bottom=0.8in, twocolumn, twoside]{geometry}
setlength{columnseprule}{0.4pt}
usepackage{amssymb}
usepackage{mathrsfs}
usepackage[centertags]{amsmath}
usepackage{amsthm}
newtheorem{theorem}{Theorem}
usepackage{epsfig}
usepackage{graphicx}graphicspath{{Graphics/}}
usepackage{amsthm}
usepackage{mathptmx}
usepackage[square,sort&compress]{natbib}
usepackage{pgf,tikz,pgfplots}
pgfplotsset{compat=1.15}
usetikzlibrary{arrows}
usepackage[T1]{fontenc}
usepackage{fancyhdr}pagestyle{fancy}
usepackage{xcolor}
usepackage{setspace}
usepackage{booktabs}
%usepackage{hyperref}
usetikzlibrary{arrows.meta}
renewcommand{baselinestretch}{1.5}
newcommandaug{fboxsep=-fboxrule!!!fbox{strut}!!!}
theoremstyle{definition}
newtheorem{Thm}{Theorem}[section]
newtheorem{lem}[Thm]{Lemma}
newtheorem{pro}[Thm]{Proposition}
newtheorem{de}[Thm]{Definition}
newtheorem{re}[Thm]{Remark}
newtheorem{ex}[Thm]{Example}
newtheorem{cor}[Thm]{Corollary}
numberwithin{equation}{section}
definecolor{uuuuuu}{rgb}{0.26666666666666666,0.26666666666666666,0.26666666666666666}
begin{document}

onecolumn                   %%% added

%include{Frontmatter/colophon}
frontmatter                 %%% added
Some front matter. lipsum   %%% added
tableofcontents
%Mainmatter
mainmatter                 %%% added
twocolumn                  %%% added
%include{Mainmatter/Chapter-1}
chapter{One}               %%% added
lipsum
end{document}

I have added text to be printed to your MWE so that you can see the result. BTW your MWE is not exactly minimal as your preamble includes many irrelevant packages wrt to your actual problem; I didn't waste my removing them. --- GOM

I want to set full page instead of using two columns?

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