I had the same experience. Only on macOS, sidebar not mouse responsive, a little bit with keyboard arrows. On iOS, TabView behaves as expected Xcode 16.1 beta 2 MacOS Version 15.1 beta (24B5055e)

This works fine for me. All entities in Group Model are deleted (and all subentities, @RelationShip delete rule is set to .cascade) : private func deleteAll() { print("delete all!") do { if try modelContext.delete(model: Group.self, where: NSPredicate(value: true), includeSubentities: false) { print("OK Groups cleared !") // what to triggers UI update, or @Query ? } } catch { print("error: \(error)") } } But, no trigger of UI/Query update…

Same problem here. Unable to build standard template in the preview canvas : `ld: Undefined symbols: unsafeMutableAddressor of self #1 : Crash.Item in Crash.Item.timestamp.init : Foundation.Date, referenced from: Crash.Item.timestamp.init : Foundation.Date in Item.o clang: error: linker command failed with exit code 1 (use -v to see invocation) Xcode 15 beta 4 Release Notes : Previewing view code in a SwiftData app results in a linker failure for the canvas despite that code compiling successfully for device and simulator. (111657477) Workaround: Run your app in the simulator to test your UI instead of using Previews.