How to make array as an Functional global variable

Im changing within different excel files for different wind speed MPPT, and i have use case structure to choose between different files with slider , how im gonna use FGV for array, i tried from other forums fgv for array (https://forums.ni.com/t5/LabVIEW/Example-on-how-to-set-an-array-as-a-Global-Variable-LV2/td-p/86531) but when i tried to change excel file from wind speed 5 to 6m/s inside the while , i didn't got change in array outside the while loop.
Thankyou