Apple has released tvOS 16.5 for the Apple TV with Multiview support.
This update adds Multiview support in the Apple TV app for watching up to four live sporting events at once on Apple TV 4K (available for MLS Season Pass and Friday Night Baseball) and includes performance and stability improvements.
You can update to tvOS 16.5 by visiting Settings > System > Software Updates on your Apple TV, or you can download tvOS 16.5 from here: ● tvOS Download Links