How to analyze the rule code part of label newline

How to analyze the rule code part of label newline in version 8.1 of lvgl, ask for advice
Now I find that when setting the text, when the Chinese and English are mixed, it will treat a series of English as one character, and change the line directly.
eg: Zhang San adfadfafasdfasd will be displayed when it is too long
Zhang San
Display if long mode is set to DOT
open…