Thank you for your suggestion. I trashed that file and returned the settings to defaults, and I found that the graphics issues almost 100% reoccurred with the "Vertical Sync" on. I turned it off once, but there was noticeable visual tearing when I zoom in or out and rotate.😢
I used to play in fullscreen mode with no other apps open. Like magic, I played it on windows mode just now, and the screen flickering issues are gone. Thank you!! But still, I hope to play The Sims fullscreen and I will see whether the next update would fix this glitch. 👼🏻
