Chosen Solution

I just replaced my iPhone X screen, and now I see two icons at the bottom of the screen which never goes away no matter what I do. Check the pic

You may have bought a low-quality OLED panel with burn-in (the icons look like they are from the TikTok app). There is nothing you can do asides from another screen replacement. Sorry! You should be able to get a refund, as you were sold a faulty display.