how do I make list items snap to the center of the screen

To make list items snap to the center of the screen, you can use a horizontally scrolling stack within a scroll view. This approach is discussed in the session "Migrate your TVML app to SwiftUI" under the chapter "Shelves." Here are the key steps:

1. Use a LazyHStack: Embed your items in a LazyHStack within a ScrollView.
2. Disable Scroll Clipping: Ensure that scroll clipping is disabled on the scroll view so that focused items can grow and cast shadows outside the bounds of the scroll view.
3. Align with Safe Area Bounds: Make sure your content aligns with the safe area bounds of the screen to keep it nicely in line with its surroundings.
4. Peek Off-Screen Content: Allow off-screen content to peek in from the edge of the screen to indicate more content is available.

Here is a relevant segment from the session:

"Our content should flow horizontally and should align itself with the safe area bounds of the screen. This will keep it nicely in line with its surroundings. It should also allow off screen content to peel peek in from the edge of the screen to indicate that more content is available in that direction. Well start building this using a horizontally scrolling stack. Ideally this will be a lazy hstack embedded in a scrollview well. Use the borderless button style to get our lockups and make sure to disable scroll clipping on the scroll view so that our focused lockups can grow and cast their drop shadows outside the bounds of the scroll view itself." - Migrate your TVML app to SwiftUI (05:12)

By following these steps, you can create a horizontally scrolling list where items can snap to the center of the screen, providing a smooth and visually appealing user experience.