I don’t think it is already out there. The Plex Media Player secondary interface ("accessed using the “Enter TV Layout” icon at the top of the screen) is still the pre-UNO interface that preceded UNO on the Roku (6.0.x). When that interface came out on the Roku last fall, users took to the forums to complain wildly.
Even though that interface had been in the Plex Media Player for some time, the issues had not been voiced like they were by Roku users. When the issues arose with the Roku version, I was actually surprised to find that interface in Plex Media Player. I had not noticed it at all. But it was and still is part of the Plex Media Player (version 2.31).
Here’s a link to the post where PlexInfo discusses being blindsided by the s#!+storm that followed that version 6.0.x release on Roku and announced development of the interface that would be named UNO.
