[Help] After MacOS clicks to stop expanding in the screen mirror, the secondary screen cannot be recognized

After MacOS clicks to stop expanding in the screen mirror, the secondary screen cannot be recognized. But after switching the user to guest, the screen can be displayed again. I want to ask for help from the bosses of Station V, which configuration file controls this? Or how can I switch new users while keeping my local files? PS: 1. Have you referred to https://discussionschinese.apple.com/thread/255891830? sortBy = rank, deleting/Library/Preferences/com.apple.windowserver.displays.plist does not restore the secondary screen. 2. I tried better Display, but the screen can't recognize it either. 3. Try to detect the display in System-"Display + opt-", but it is still not recognized.