Seeing videos of other gameplay, it allows the players (not the DM) to hit a "End Turn" button which will end their turn, advance the turn order tracker to the next in line, so the DM doesn't have to always ask anything else, or manually do it themselves. I +1 this, I have asked my players to let me know when they are done, and they still forget. This way they have a button they can click to end their turn without having to say anything. Once they hit end turn, I will notice the turn tracker advance and can continue with next in line.