I also faced same issue Run xCode using sudo /Applications/Xcode.app/Contents/MacOS/Xcode from terminal and then download the simulator My issue was fixed

As from this stackOverFlow question You need to add this code in App Delegate or Scene Delegate for swiftUI If you set sizeRestrictions.maximumSize and sizeRestrictions.minimumSize to the same value, the window will not be resizable. To do so, just call this in your application:didFinishLaunchingWithOptions method (if you're using UIKit): UIApplication.shared.connectedScenes.compactMap { $0 as? UIWindowScene }.forEach { windowScene in windowScene.sizeRestrictions?.minimumSize = CGSize(width: 480, height: 640) windowScene.sizeRestrictions?.maximumSize = CGSize(width: 480, height: 640) } Note: You need to run this in OSX 10.15 Beta 5 or later, otherwise it will crash

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