Is there a way to prevent the pause menu from appearing when tabbing out of the game? [closed]
If you open a crafting/inventory/smelting window it will not pause the game when you ALT-TAB out of the game.
Try opening Chat window instead. (press T) The chat window is transperant, and the game is essentially "paused" (you can't move and use items) while it waits for you to type something. Obviously don't type anything and when you are done you can press T again to make it go away.
f3 + p toggles a mode in which you get exactly that, it doesn't pause automatically when not in focus.
Answer from: Can I alt-tab out of Minecraft without the game auto-pausing?