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Mobile, console and PC separate when platform based matchmaking is enabled. Platform based matchmaking enables in SkyWars, Survival Games and Treasure Wars with individual queues of 300+ players.
Players that use controllers / mouse+KB on a touch device are currently queued into Touch games. Additionally, players that use mouse+kB on console are queued into console games. We are working on a solution for this.
You can learn more about this feature on our support page, The Hive - Platform Matchmaking.