Return the system and order with a different type of screen.  The 9520 is available with both conventional and OLED screens -- whichever type you've tried, order the other.

Yes. It's the OLED screen, touch screen.

Sounds similar to this thread.

Did you get the OLED screen ?

https://www.dell.com/community/XPS/OLED-quality-issue/m-p/8269776/highlight/true#M102037

I recommend you read the whole thread, including OP's and all my posts.