How can you show item builds and cs in spectating?

Its X

Hit tab.

Hold tab or hit o

Might be the new client, but not entirely sure since I haven't tried spectating, only looking at my own replays where the scoreboard is naturally hidden until you press tab and the whole thing pops up from underneath the time bar at the bottom.

tab as always to bring up the entire team comps or just press O and it shows it for as you watch whatever champ

press I and it's the scoreboard option