Optidef package latex specify supremum instead of maximize

Question

I am trying to create an optimzation problem which looks like this:

I use Optidef for all my optimization problems but should I be using regular align environment for this?

Answer 1

With the \underset macro from amsmath:

\documentclass[border=2mm]{standalone}

\usepackage[]{amsmath}

\begin{document}
$ \underset{y\geq0}{\sup\psi(y)} $
\end{document}

No need for align or the like.