What is the Line Settings function used for in automatic production?

[c0194112]

Hard for me to tell in Chinese and without a full screenshot to know where you are in the game.

If it's the old production system, Bounty #17 added the ability for the player to adjust when the auto production system adds a new production line when the AI adjusts production output. https://www.ventdev.com/forums/showthread.php?tid=3799

If it exceeds 70%, the system will automatically build a new production line?