automatic script calibration when device hdmi cable is disconnected

Help
1

greetings how can I make my device set the wallpaper when the hdmi cable is pulled out

2

Probably only with great difficulty.

Can you explain what your ultimate end goal is?

3

Hi, when disconnect the hdmi cable, it automatically takes the wallpaper that is on the 2nd screen, but I want it to stay on the wallpaper that is available on the internal screen