move appendix to next page overleaf
\documentclass{article}
\usepackage{appendix}
\usepackage{etoolbox}
% Inserts \clearpage before \begin{appendices}
\BeforeBeginEnvironment{appendices}{\clearpage}
% Inserts \clearpage after \end{appendices}
%\AfterEndEnvironment{appendices}{\clearpage}
% Inserts \clearpage before every \section within appendices environment
%\AtBeginEnvironment{appendices}{\pretocmd{\section}{\clearpage}{}{}}{}
\begin{document}
\section{Pre1}
\section{Pre2}
\begin{appendices}
\section{App1}
\section{App2}
\end{appendices}
\section{Post1}
\section{Post2}
\end{document}