Question TextMeshPro Newline problem

As shown in the picture, I entered several 'a' in the input box, and then added a space character after the third 'a', and then it automatically wraps the line, it seems that it is because it puts all the ' a' is recognized as a word, and this problem also occurs when using numbers or other letters. How can I operate it so that it only has space characters and no new lines, I have used <nbsp><nobr> and so on, the labels are invalid.

 

TextMesh Pro Version ：2.1.6