\documentclass[14pt]{report}
\usepackage[english,russian]{babel}
\usepackage{setspace}
\usepackage[unicode]{hyperref}
\usepackage[utf8]{inputenc}
\usepackage{xcolor}
\usepackage{amsmath}
\usepackage{wasysym}
\usepackage{latexsym}
\usepackage{indentfirst}
\usepackage{mathtools}
\definecolor{linkcolor}{rgb}{0.0,0.0,0.0}
\definecolor{urlcolor}{HTML}{799B03}
\hypersetup{pdfstartview=FitH, linkcolor=linkcolor,urlcolor=urlcolor, colorlinks=true}
\usepackage[14pt]{extsizes}
\usepackage[
    left=30mm,
    top=20mm,
    right=10mm,
    bottom=20mm
]{geometry}
\usepackage{graphicx}
\usepackage{subfigure}
\usepackage{afterpage}
\usepackage{titlesec}
\usepackage{float}
\usepackage{listings}
\usepackage{csquotes}
\usepackage{mathrsfs}
\usepackage{amssymb}
\usepackage{caption}

% figure caption type changed
\captionsetup{labelsep=space}
\addto\captionsrussian{\renewcommand{\figurename}{Рисунок}}
% chapter settings
\titleformat{\chapter}[display]   
{\centering\Large\bfseries}{\chaptertitlename\ \thechapter}{10pt}{\Large}   
\titlespacing*{\chapter}{5pt}{-20pt}{30pt}

% section settings
\titleformat{\section}[block]
  {\large\bfseries}
  {\thesection\ }{0pt}{}

% settings for chapters and sections
\addto\captionsrussian{% Replace "english" with the language you use
  \renewcommand{\contentsname}%
    {\centering \large ОГЛАВЛЕНИЕ}%
  \renewcommand{\chaptername}{ГЛАВА}
  \renewcommand{\chaptertitlename}{ГЛАВА}
  \renewcommand{\bibname}{\large СПИСОК ИСПОЛЬЗОВАННОЙ ЛИТЕРАТУРЫ}
}

\renewcommand{\baselinestretch}{1.2}

\begin{document}
\include{title}
\tableofcontents
\include{abstract}
\include{intro}
\include{work}
\include{conclusion}
\include{literature}
\include{appendix}
\end{document}

\grid