Ben Platt, left, as Leo Frank, and Alex Joseph Grayson as Jim Conley, in the musical “Parade” at the Bernard B. Jacobs Theater in New York, on Feb. 18, 2023. The minimal set by Dane Laffrey is essentially a high platform on a low one, suggesting a witness box, a cell and a scaffold, our critic writes. (Sara Krulwich/The New York Times).