macOS Big Sur Sidebar with macOS Catalyst

Hello,

Xcode 12.2 beta, macOS 11.0 beta 9.

Do you know how to tweak a macOS 11.0 Catalyst app so that the sidebar is just like the refreshed, redesigned ones in macOS Big Sur? When I try Optimize for Mac Interface on my existing iPad app with this code

Code Block 
NavigationView {
		List {
				NavigationLink (destination: ContentView()) {
					Text("Example Sidebar Name")
				}
		}
		.listStyle(SidebarListStyle())
	}

I get a classic Catalyst app without a progressively blurred sidebar and rounded selection indicator, and with a header on the entire window. Could you help me with achieving the new style and possible informing me of a guard statement I can use to selectively change parts of my iPad app for Mac?

Thank you in advance.