% set image on full page width with figure* and width= extwidth
egin{figure*}[thpb]
centering
includegraphics[width= extwidth]{images/my_image.png}
caption{Caption}
label{fig:my_image}
end{figure*}
Add a * to figure in egin and end clauses
egin{figure*}
includegraphics[width= extwidth]{example}
caption{Example caption.}
end{figure*}