Not around the TV right now, but they increased the size of the thumbnails in the first row of "Recommended" content to the point where only one is visible fully. (Not unlike new Netflix UI)

I might be in some A/B test tho.

ahh, that sounds like a poor UI indeed given the screen real-estate.

https://variety.com/wp-content/uploads/2021/05/YouTube-TV-Ro... - this is best case scenario, 2 whole thumbnails fit on the screen. And depending on category (selected on left) it might be just one - just imagine it truncated at the place right support bracket is.