horizontal
.
.. subfigure:: AB

   .. image:: image.png
      :alt: hallo1

   .. image:: image.png
      :alt: hallo2
.
\begin{figure}[htbp]
\centering
\begin{subfigure}{0.495\textwidth}
\centering

\noindent\sphinxincludegraphics{{image}.png}
\end{subfigure}
\begin{subfigure}{0.495\textwidth}
\centering

\noindent\sphinxincludegraphics{{image}.png}
\end{subfigure}
\end{figure}
.

vertical
.
.. subfigure:: A|B

   .. image:: image.png
      :alt: hallo1

   .. image:: image.png
      :alt: hallo2
.
\begin{figure}[htbp]
\centering
\begin{subfigure}{0.99\textwidth}
\centering

\noindent\sphinxincludegraphics{{image}.png}
\end{subfigure}

\begin{subfigure}{0.99\textwidth}
\centering

\noindent\sphinxincludegraphics{{image}.png}
\end{subfigure}
\end{figure}
.

span columns
.
.. subfigure:: AA|BC

   .. image:: image.png
      :alt: hallo1

   .. image:: image.png
      :alt: hallo2

   .. image:: image.png
      :alt: hallo3
.
\begin{figure}[htbp]
\centering
\begin{subfigure}{0.99\textwidth}
\centering

\noindent\sphinxincludegraphics{{image}.png}
\end{subfigure}

\begin{subfigure}{0.495\textwidth}
\centering

\noindent\sphinxincludegraphics{{image}.png}
\end{subfigure}
\begin{subfigure}{0.495\textwidth}
\centering

\noindent\sphinxincludegraphics{{image}.png}
\end{subfigure}
\end{figure}
.

empty area
.
.. subfigure:: AB|.C

   .. image:: image.png
      :alt: hallo1

   .. image:: image.png
      :alt: hallo2

   .. image:: image.png
      :alt: hallo3
.
\begin{figure}[htbp]
\centering
\begin{subfigure}{0.495\textwidth}
\centering

\noindent\sphinxincludegraphics{{image}.png}
\end{subfigure}
\begin{subfigure}{0.495\textwidth}
\centering

\noindent\sphinxincludegraphics{{image}.png}
\end{subfigure}

\begin{subfigure}{0.495\textwidth}
\centering

\noindent\sphinxincludegraphics{{image}.png}
\end{subfigure}
\end{figure}
.
