The code below builds a circular diagram. There is no arrow from 11 to 0. This is intentional. However, I need the "0" node in the 12 o’clock position. Reordering the numbers in the \smartdiagram command rotates the nodes but removes the wrong arrow. The diagram must behave like a Ferris wheel---the bottoms of rectangular nodes should remain horizontal---so rotating the entire diagram will not work.
\documentclass[]{standalone}
\usepackage{smartdiagram}
\smartdiagramset{circular distance=7.5cm,
circular final arrow disabled=true,
uniform color list=gray for 12 items,
arrow tip=to,}
\usepackage{tikzpagenodes}
\begin{document}
\smartdiagram[circular diagram:clockwise]{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11}%
\end{document}


180+360/\maxsmitem*\xiwhere\maxsitemis the number of items and\xiis each individual item. That causes the position of the LAST element to always be at 180, while the first element shifts according to the number of items. It don't see how you could solve that other than redefining it in the package code... – Markus G. Aug 11 '21 at 15:18