[2023] Game launch error: "Failed to create a graphics device. Exiting."

Please try this:

- uninstall the nVidia driver and all other nVidia software
- reboot
- install march 2023 https://www.nvidia.com/Download/index.aspx?lang=en-us
- reboot again

Does that help? If not, DXDIAG is a program you run from the Windows search box on the task bar. 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 here your Documents/Paradox Interactive/Stellaris/settings.txt and pdx_settings.txt .
From your Documents/Paradox Interactive/Stellaris/logs/ folder, attach here system.log , error.log .