When I was writing my thesis, I suddenly thought of this problem. I looked everywhere, but I didn't see the answer. The macro threshold is a bit high for most people.

In fact, it is very simple, menu bar view-display, open the navigation pane, and you can see the chapter objectives. Right-click any chapter title and select "Select Title and Content". After selection, you can see the number of words in the chapter in the lower left corner, provided that the level of the article is edited in advance.