Hello, glad to hear that you like it!
If you want to disable white screen effect you should firstly open “GrenadesLibrary” blueprint:
Then open “SetupFlashbangEffect” function:
And finally set “Max Brightness” value in “Set members in PostProcessSettings” node to 1 to completely disable white screen effect:
Also you can set “DirtMaskIntensity” to 0 if you want to disable that dirt mask texture.
Hope I’ve answered your question!