I did what you suggested. It worked when I shut down or restart my laptop normally, but there is still a weird problem. This problem occurred after I made some changes to Device Manager (when I tried to disable some Monitors and Display Adapters), even though I enabled all of them afterwards.
When I close the lip of my laptop and reopen it, the default screen will always be switched to screen 2. Even more strangely, when screen 2 is activated in this way, sometimes the brightness of it is so low that I can see nothing on that screen clearly. I have to restart the laptop everytime I encounter this to switch the screen back to screen 1. Why it happens and how to solve it? Thanks.