Yes, full L2 and when I place my order it usually shows up in full. Occasionally I'll place some odd amount of shares like 13k rather than 10k, just to see if it shows, and it nearly always shows.
Let's say there's 10k shares on the bid and I place 17k share order at the same price. If the order goes to the same market maker it will usually then show 27k on the bid. If it goes to different market maker, I'll just show up as 17k alone with that mm, in addition to the other guy's 10k at the same price with different mm.
Very rarely, but once in a while especially on super thin stocks, it'll go to the one market maker on the stock and not show . . . .but I usually still get executed for at least some if it trades at that price. I don't know the mechanics of it all, but it literally feels like some guy is asleep at a screen and once a trade goes off, alarm bells go off, he's startled awake, spills his coffee doing so, and then gets back to work. Maybe some computer program at the mm literally goes into like a sleep mode when there's no trades for a long time or something, I don't know
