How to create a text which can support more than 500 chars ?

Hi all:

In my interactive form, I have one text, the value inside this text is longtext, the length will be more than 500 chars.

My problem is now , if there is more than 100 chars, there will be duplicated chars in this text.

Can I make this text support overlap ? when the value have too many chars, it will display in next row ? is it possible ?