This pack changes the character limit in all text boxes to one million, and lets you add new lines! It won't be a problem trying to see the lines, because it's aligned to the bottom left.
There is a subpack option to enable or disable the new line modification for chat screen because pressing enter on keyboard = send button by default. Some keyboard+mouse players do not want to click the send button with their mouse every time.
Select version for changelog:
Changelog
Latest change: added Boostellar link.
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mcpedl.com/an-anvil-that-can-name-items-in-new-lines/