Not the red pin the little black piece that slides back and forth that holds the plate (the red button moves it). As to using it horizontally, in the marketing video it goes on about how it can be used as a tripod head. Which is why the pro version has a thread in the bottom
Sorry just realised you were talking about the v2. I have a v3 and it doesn’t have a red pin so was confused for a sec there but realised we are talking about different things













