I've been heavily working with this beta since v1, and I've received this error, and many others relating to NavigationSplitView. However, I believe every time it was relating to an issue in my code. Various things to look out for: inspector, if you have a parent view with specific frame requirements, inset rules, custom layouts, etc. Keep in mind I just recently picked up Swift + SwiftUI -- so I could be leaving out other important considerations. If I were you, I would look at that error message -- here's a snippet that should help you debug your layout that is called out specifically: import SwiftUI @main struct Application: App { #if os(macOS) // @NSApplicationDelegateAdaptor(Delegate.self) var delegate #endif init() { #if DEBUG && os(macOS) // Layout constraint debugging UserDefaults.standard.set(true, forKey: "NSConstraintBasedLayoutVisualizeMutuallyExclusiveConstraints") #endif } var body: some Scene { WindowGroup { Features.Shell.UI.Main() .windowResizeAnchor(.center) } } } I apologize formatting may not be perfect

Hello! I was able to get a couple of patterns down for glass in charts; some through views and others with chart-specific protocols. here's an example .annotation: extension Charting.Views.Stock.Selection { struct Annotation: View { private let low: Double private let high: Double private let open: Double private let close: Double private let gain: Bool private var time: String public init(_ data: Charting.Model.Candle) { self.low = data.low self.high = data.high self.open = data.open self.close = data.close self.gain = data.gain self.time = data.date.formatted(.dateTime.hour().minute().timeZone(.exemplarLocation)) } @Environment(\.colorScheme) private var colors var body: some View { VStack(alignment: .leading) { Group { HStack { Text("Low").font(.caption) Spacer() Text(low, format: .currency(code: "USD")) } HStack { Text("High").font(.caption) Spacer() Text(high, format: .currency(code: "USD")) } Divider() HStack { Text("Open").font(.caption) Spacer() Text(open, format: .currency(code: "USD")) } HStack { Text("Close").font(.caption) Spacer() Text(close, format: .currency(code: "USD")) } HStack { Spacer() Text(gain ? "+" : "-") Text(abs(open - close), format: .currency(code: "USD")) } Divider() HStack { Spacer() Text(time) } } .foregroundStyle(colors == .dark ? Color.white : Color.black) } .padding() .glassEffect( .regular.tint( gain ? Color("Chart-Candle-Green").opacity(0.25) : Color("Chart-Candle-Red").opacity(0.25) ), in: RoundedRectangle(cornerRadius: 8, style: .circular) ) .background( RoundedRectangle(cornerRadius: 8, style: .circular) .fill( .ultraThinMaterial.opacity(0.25) ) ) .opacity(0.25) } } }