How do I enable the floating photo screensaver on a new AppleTV?

Installed a new 4k AppleTV and can't figure out how to select the floating photo screensaver on the new device. Still works on the older ones. This is such a cool feature. Uses Home Sharing photos from my Mac and displays them as a screensaver. I've set the new AppleTV up several times now, but the only similar option for screensaver is a slideshow mosaic thing. Prefer the floating version but can't figure out how to make it available. Any assistance appreciated.

[Re-Titled by Moderator]