\documentclass[a4paper,openany,14pt]{book}

\usepackage[top=30mm,bottom=25mm,left=25mm,right=30mm,
includehead=true,includefoot=true]{geometry}

\usepackage{subfigure}
\usepackage[subfigure]{tocloft}

%\usepackage{caption}

\usepackage[font=Large,labelfont=Large]{caption}


\usepackage[colorlinks=false,linkbordercolor={1 1 1},pdfborder = {0 0 0}]{hyperref}[2010/09/11]

\usepackage{tocbibind}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%\usepackage{tocloft}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


\usepackage{amsmath}
\usepackage{tikz}
\usetikzlibrary{calc}

\usepackage{fancyhdr}
\pagestyle{fancy}

\usepackage{titlesec}

\usepackage{bidiftnxtra}
\usepackage{footmisc}
\usepackage{indentfirst}
\usepackage{graphicx}


\usepackage{xepersian}

\settextfont[Scale=1]{B Nazanin}
\setlatintextfont[Scale=0.86]{Times New Roman} % 11pt

\titlespacing*{\chapter}{0pt}{10pt}{1pt}
\titlespacing*{\section}{0pt}{1pt}{4pt}
\titlespacing*{\subsection}{0pt}{1pt}{4pt}


\DeclareMathOperator*{\argmin}{\arg\min}   

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\fancyhead{}
%\fancyfoot{}
\fancyhead[R]{\leftmark}
\fancyhead[L]{\thepage}
%\fancyfoot[C]{\thepage}

\renewcommand{\headrulewidth}{2pt}
%\renewcommand{\footrulewidth}{2pt}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\makeatletter
\newcommand*{\Computebaselinestretch}[1]{%
  \strip@pt\dimexpr\number\numexpr\number\dimexpr#1\relax*65536/\number\dimexpr\baselineskip\relax\relax sp\relax
}
\makeatother
\linespread{\Computebaselinestretch{1.15cm}}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\renewcommand\cftchappagefont{\fontsize{14pt}{15pt}\selectfont}
\renewcommand\cftsecpagefont{\fontsize{14pt}{15pt}\selectfont}
\renewcommand\cftsubsecpagefont{\fontsize{14pt}{15pt}\selectfont}

\renewcommand{\cftchapfont}{\fontsize{14pt}{15pt}\selectfont}
\renewcommand{\cftsecfont}{\fontsize{14pt}{15pt}\selectfont}
\renewcommand{\cftsubsecfont}{\fontsize{14pt}{15pt}\selectfont}

\renewcommand\thesubfigure{\fontsize{14pt}{15pt}\selectfont(\alph{subfigure})}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\begin{document}
\setlength{\parindent}{1pt}

این یک مثال است.
\newline
این یک مثال است.


\end{document}