Same issue on beta 4. Not sure what I'm missing but can't seem to get this to work, pretty frustrating. I saw someone on Twitter say upgrading to macOS 13 beta fixed it for them, but that's not something I want to do on my personal machine right now.

I ran into this same thing as well and managed to fix it by putting this code in the view controller: override func viewDidLayoutSubviews() {     super.viewDidLayoutSubviews()     navigationController?.navigationBar.prefersLargeTitles = true }