Multiline property

Text input boxes support a single line by default. When Multiline is set to No (by default), a text input does not wrap text or resize itself vertically.

multiline-false

When Multiline is set to No, you can clear any text that was previously typed by clicking this icon:

multiline-false-clear-button

If you set Multiline to Yes, then a text input accepts multiple lines of text. 

multiline-true