SMS is in black mode. How to change back to white?

I want to ask Apple how to change the SMS in black mode back to white. Change back to white as follows:

1. First open the settings icon, find the general options, and open it.

2. Then, on the General Options page, find the accessibility and open it.

3. Finally, find the display adjustment, turn off the green icon on the right side of smart inversion and classic inversion, and the SMS page of Apple's mobile phone will be restored from black mode to white page.