Unable to update Columns in Test Cases view

On the Test Cases tab under Design view, I can't seem to change the columns displayed.

I've clicked on the "Columns" button and the "Column Chooser" drop-down box appears, but any selection/deselection and clicking "Update" returns the exact same default view.

I've also tried the same on different browsers (Chrome, Edge) but same broken functionality.

Please advise.

Thanks,

Amit