Unreal editor play problem..

Hello,

I new to Unreal.

I got an issue with the demo DesertRallyRace, only with this demo.

In unreal the first pic seem normal, if I click Play, I got blurry result.

I search everywhere and Make sure that in "Setting->EngineScalability Setting-> I chose Epic , Also the Material Quality Level to High also Preview rendering Level to Shader model 5

my Pc is an Alienware with 8g memory card , 16g memory system…

I wonder what’s wrong

I tried to put Post Process Volume in the poject and tried many configuration without change.

It’s surely a setting that I don’t know that cause all this.

if someone can help

thanks