same question , use container.mainContext.autosaveEnabled = false didn't work for me

do { let container = try ModelContainer(for: schema, configurations: [modelConfiguration]) container.mainContext.undoManager = UndoManager() return container } catch { fatalError("Could not create ModelContainer: (error)") }

do { let container = try ModelContainer(for: schema, configurations: [modelConfiguration]) container.mainContext.undoManager = UndoManager() return container } catch { fatalError("Could not create ModelContainer: (error)") } when you need to undo @Environment(\.modelContext) var modelContext modelContext.undoManager?.undo()