Caption placement for double column figure in Elsevier document

Question

I am unable to get my caption to be properly (left) spaced below a figure in a double column document. This is using the Elsevier double-column template. No errors or warnings are present but the placement of the caption is to the right quite a bit, as shown below. The caption is supposed to start at the left edge of the figure. I've tried using \usepackage{caption}, \captionsetup, and a number of other methods through Google-fu.

\documentclass[a4paper,fleqn]{cas-dc}

\usepackage[numbers]{natbib}
\usepackage{graphicx}

\begin{document}

\maketitle

\begin{figure*}[] 
  \includegraphics[width=\textwidth]{Diagram_v4.eps}
  \caption{\label{fig:Prototype_view} Caption stuff.Caption stuff.Caption stuff.Caption stuff.Caption stuff.Caption stuff.Caption stuff.}
\end{figure*}

\end{document}

Answer 1

If you remove the empty [] after \begin{figure*} the caption should be fine.

Answer 2

Add \AtBeginDocument{\setlength{\FullWidth}{\textwidth}} at the code header to fix the \textwidth length.

Then you can control better your floats: \begin{figure}[h!, align=\flushleft, width=\textwidth]