\documentclass{article}
\usepackage{graphicx,subcaption}
\begin{document}
\begin{figure}[h!]
\centering
\begin{subfigure}{4.4cm}
\centering
\includegraphics[height=3.3cm, width=4.4cm]{example-image}
\caption{...}
\end{subfigure}%
\begin{subfigure}{4.4cm}
\centering
\includegraphics[height=3.3cm, width=4.4cm]{example-image}
\caption{...}
\end{subfigure}%
\\
\begin{subfigure}{4.4cm}
\centering
\includegraphics[height=3.3cm, width=4.4cm]{example-image}
\caption{...}
\end{subfigure}%
\begin{subfigure}{4.4cm}
\centering
\includegraphics[height=3.3cm, width=4.4cm]{example-image}
\caption{...}
\end{subfigure}
\\
\begin{subfigure}{4.4cm}
\centering
\includegraphics[height=3.3cm, width=4.4cm]{example-image}
\caption{...}
\end{subfigure}%
%\caption{Graph trajectories of $S$, $E$, $I$, $R$, $B$ at $R_0<1$}
\label{fig2}
\end{figure}
\end{document}
I want to change the caption (a), (b), ... , (e) into Figure 1., Figure 2., ..., Figure 5. How to do it? I want the layout figure same as picture, so I'm using subfigure. But I don't know how to change the caption.