Dell Optiplex 9020 All In One scrambled screen

I new at attempting to install macos on pc hardware. SO I decided to try on my old Dell Optiplex All in one with a Core i5-4670S with an iGPU.

The issue is the built in screen is not displaying correctly, I get a scrambled screen once it starts to boot the installer. When I attached an external hdmi screen it works correctly.

I was able to get 10.15.7 installed but I still have this screen issue. Is there anything I need to do to get the built in screen working correctly?
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Author: sparcv