Oh wow. The problem is because of that~! Thank you so much.
But do I need to assign graphic card every single time when I open blender?

Hi. Yes I do. I have one LG wide screen monitor and one cintiq display tablet

Hi Pratik.
It happens whenever I click other viewport shading mode like 'Material Preview' or 'Rendered'. It just crashes without any messages, but sometimes Blender pops up that I need to have Cuda graphic card and/or latest driver for it, but I already have GTX 3060 with latest driver.
It happens on Blender 3.0.1 and 2.9.3, but it works fine with Blender 2.83.
Also, it happens when only starting cube is there even
Yes. I tried factory preferences, but it didn't work