Hi, on an Apple TV 4K (latest gen), Multiview in 7.0 was not working right. Saw TestFlight fixed it. Downloaded the latest TestFlight version and Multiview was not there (I saw in the notes that it "removed the option from non compatible devices." I rolled back to the build just before, and now Multiview is back and working great. I think the latest build seems to think my Apple TV 4K isn't compatible.
Running tvOS 26.1, the latest official release (non-beta).