In word, my last line of words is always centered, and there is nothing in front of it. If I delete it, I will delete the text on the top line ... Please tell me how it is, Hero.

that's because you are using the center format, because all the lines in front of you are full, so you just can't see it. You can try to add words to know, it should be slowly expanding to both sides. Just adjust the format to left. Put the mouse on the last line, and then select the toolbar "Paragraph"-left, and you can do it.