[2020] Problem with NVIDIA GeForce GTX 1050 Ti

In the game launcher please set Display mode to windowed.

Does that help?  

DXDIAG is a program you run from a command prompt or the Windows start menu 'run' dialog box (or 'search programs' in Windows 7 or later). After running it will open a window and start collecting info with a progress bar in the lower-left corner. When it completes click the 'save all information' button and save it to a file then attach that file here.

Please attach your Documents/Paradox/CK3/pdx_settings.txt .
From your Documents/Paradox/CK3/logs/ folder, attach system.log , error.log  

leRoi-Soleil said: I tried and i forced, but it not working.

It hasn't worked as the game is running on the Intel, we can see in those logs:

"device"={
version=0
value="Intel(R) HD Graphics 630"
}

[17:52:04][contextowner.cpp:742]: GPU Name: Intel(R) HD Graphics 630
[17:52:04][contextowner.cpp:743]: GPU Vendor: Intel

In fact the nVidia driver should do that automatically without being forced to. Please try this:
- uninstall the existing nVidia driver, and all other nVidia software
- reboot
- install the latest by fresh download from here:
Download Drivers | NVIDIA - reboot again

Good luck with that!