There are two type of events in the app, Orderbook and Instant match events. In orderbook events you can place limit order to set the price you want to per share as well as Market order based on the available price, On the other hand for Instant match events, there is only an option for market order based on the current demand and supply of the shares of Yes and No. You cannot place Limit order in Instant match, and only market order is possible, thats why there is no order book in few events.
