As shown on the seatmap pic below Y+ rows are in the 2-4-2 config. Row 39 is the first row after Y+. Middle seats remain the same as other Y rows which is 3 across, but why are the window rows 2 abreast? Is it actually still 3 across but it's just that one of them are blocked out as a crew seat?

I doubt that row 39 is still in the Y+ section, otherwise it should've been assigned as row 34.