The workflow shown below will retrieve the minimum or maximum displacement results for a Design Area Element as a whole. It works by first deconstructing the Design Area Element to retrieve the list of analysis shells. Then the minimum or maximum displacement for each shell is computed. Afterwards, the resulting nodal displacement is deconstructed, which converts the displacements into the display units (same as model units) and outputs them as doubles. The maximum (or minimum) value of the list of shell displacements is then computed.
Note: The workflow below is for maximum displacement. For minimum displacement, check the "Min" button for Min/Max on the Shell Displacement component, and use Min of List instead of Max of List.