It is about iPad 7th generation

I saw a video of going into settings and going into per app and turning on homescreen and clicking smart invert then clicking on; so that the baterry will turn into a random color and it worked ; it was all normal until i shutdowned my ipad for a few day and today i turned my iPad on and my wallpaper was white and everything else was white and when i went into a app inside the app it’s all white also YouTube is white too