Hello, I have solved the problem. All you need to do is disable MFAA and FXAA in nvidia settings.
MFAA blurs specific text.
If you turn off MFAA and turn on FXAA, then the blur of the entire picture really appears.
Addition:
NVIDIA Driver: 536.40 Date: 06/29/2023
GPU - RTX 3060 Vision OC 12Gb
CPU - I5 10400F 2,90 GHz
MB - MAG B560M Mortar
RAM - Kingston Fury Beast 2*8Gb
Display - MSI G2422 | Display Port
PSU - RM750x Gold Corsair
Let this addition be here, perhaps it will be useful someday 
This is all I found while experimenting with the solution.