Figma To Code Youtube vid

Hey guys! So I was watching Code With Chris Figma To Code - YouTube
And I had a quick question, as I’m trying to learn how to relate Chris’s code to the Apple documentation. I looked up navigationBarTitleDisplayMode but it only showed “func navigationBarTitleDisplayMode(_ displayMode: NavigationBarItem.TitleDisplayMode) → some View” on Apple Documentation. Am I researching it wrong there? I’m trying to figure out how to be able to look up and reference Apple Documentation.

Thank you for the help in advance!