\documentclass[twoside]{article}

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% redefines sidenote size
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\usepackage{fontspec}
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\setsansfont{Lato}


\usepackage{titlesec}
\titleformat{\chapter}[display]
{\normalfont\sffamily\huge\bfseries\color{blue}}
{\chaptertitlename\ \thechapter}{20pt}{\Huge}
\titleformat{\section}
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{\thesection}{1em}{}
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\begin{document}






неприпод$\widearc{нес}\widehat{ённ}\widehat{ость}$











\end{document}