https://texdoc.org/serve/smartdiagram/0
page 4 has a basic circular diagram.
\begin{center}
\smartdiagram[circular diagram]{Set up,Run,Analyse,Modify~/ Add}
\end{center}
I want to set
*each box shape rectangle without any shades
*each box has no filling color (transparent)
*arrow color black and a direct edge
Please advise.