Why do some parts of the screen not work?

So after all day today of browsing forums and videos to get pc and desktop to recognize my phone to find out I can’t update so i factory reset the phone. Then during the on screen setup I realized I couldn’t tap on certain areas at all which made it difficult I read about voice over so used that.

Now I’m curious since the phone was dropped would that cause some parts of the screen to not have any sensor at all? What’s the proper name I tried google but keep getting Touch ID, is it simply touch sensor? Is there a possible in home fix to this? I’m for sure not even going to bother with Apple , price probably going to be few hundreds. If I can’t fix at home does ifixit have anything related to my issue?