\documentclass[10pt]{beamer}
\usetheme{Warsaw}
\usepackage{enumitem}
\usepackage{fontspec}
\usepackage{polyglossia}
\usepackagee[arabic]{babel}
\setbeamertemplate{section in toc,subsection in toc}[circle]
%\setbeamertemplate{toc}[right]
%\usepackage{arabtex}
%\setlatintextfont{Times New Roman}
%\setbeamertemplate{frametitle continuation}{\insertcontinuationcount}
\setbeamertemplate{frametitle continuation}{\gdef\beamer@frametitle{}} % framebreaks without numbering
\setbeamertemplate{frametitle}[default][right]% align the frametitle to the right
%\setdefaultlanguage{english}
\setmainlanguage{english}
\setotherlanguage{arabic}
\setmainfont{Times New Roman}
\setotherlanguage[calendar=gregorian,numerals=maghrib]{arabic}
\newfontfamily\arabicfont[Script=Arabic,Scale=1]{B Nazanin}%
\newfontfamily\arabicfontsf[Script=Arabic,Scale=1]{B Nazanin}%
\graphicspath{{pics/}}
%
%~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
\newcommand{\ar}{\textarabic} % to change the laguage in the section and frame title to persian
% This work as: \a{متن فارسی}
%~~~~~~~~~~~~~~~~define bullet for enumerate~~~~~~~~~~~~~
\newcommand{\myenum}[1]
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\hspace{1pt}%
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%~~~~~~~~~~~~~~~~~~define bullet for itemize~~~~~~~~~~~~~~~
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\hspace{1pt}%
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%~~~~~~~~~~~~~~~~~~~~~~~~~~
\newcommand{\myitemII}{\par\vspace{3pt}\hspace{5mm}\LR{\hspace*{3pt}%
\begin{pgfpicture}{-1ex}{-0.65ex}{1ex}{1ex}
\usebeamercolor[fg]{item projected}
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\hspace{1pt}%
}}
%*************************************************************************
%\addtobeamertemplate{block begin}{}{\justifying} %new code
%~~~~~~~~~~~~~~~~~~~~~
\begin{document}
%\selectlanguage{arabic}
\title{\textarabic{بررسی گذار فاز فرومغناطیس مایع $ ^3He $ با استفاده ازروش $LOCV$}}
\author{Mohammad T. Mohammadi Sabet}
\date{\today}
%
\frame{\titlepage}
%
\begin{frame}
\frametitle{\textarabic{فهرست مطالب}}
\begin{minipage}{1.\textwidth}
\begin{Arabic}
\tableofcontents
\end{Arabic}
\end{minipage}
\end{frame}
\section{\textarabic{مقدمه}}
\subsection{\textarabic{مایع $^3He$}}
\begin{frame}
\frametitle{\textarabic{سیستمهای فرمیونی همبسته:مایع $^3He$}}
\begin{minipage}{.95\textwidth}
\begin{Arabic}% ----------------------here must be changed
%
\begin{itemize}[label=\protect\myitemII, rightmargin=0mm]
\item
متن فارسی .....
\item
متن فارسی ....
.\item
متن فارسی .....متن فارسی .....
\item
متن فارسی .....
\item
متن فارسی .....
\end{itemize}
\begin{columns}
\column{.3\textwidth}
\begin{itemize}
\item{\color{blue}{Fine tuning}}
\item{\color{blue}{$ \xi \thicksim (T-T_{c})^{-\nu}$}}
\end{itemize}
\column{.35\textwidth}
%\includegraphics[scale=0.35]{magnetization.png}
\column{.35\textwidth}
%\includegraphics[scale=0.35]{cv.png}
علی بی غم
%
\end{columns}
%
%
\end{Arabic}
\end{minipage}
\end{frame}
\end{document}