When I was writing my thesis today, I was also troubled by this problem. But the solution is simple: I guess the topic owner used the first line indentation at the beginning when setting the paper format. As long as the first line of the paragraph is indented into two words, the problem will be solved.

If you use word's own directory creation function to set the first directory, you can also save the directory as text first, and then use the indentation function to set the indentation by 2 characters to solve the problem. ^_^