overleaf subfigures
% Side-by-side subfigures
\usepackage{subcaption}
\begin{figure}[h]
\begin{subfigure}{0.5\textwidth}
\includegraphics[width=0.9\linewidth]{image1}
\caption{Caption1}
\label{fig:sub1}
\end{subfigure}
\begin{subfigure}{0.5\textwidth}
\includegraphics[width=0.9\linewidth]{image2}
\caption{Caption2}
\label{fig:sub2}
\end{subfigure}
\caption{Subfigures}
\label{fig:Figure1}
\end{figure}