@lovlinus The options.ini file has two relevant entries, one for fullscreen and one for windowedfullscreen . I believe that if the first is set to 1, the game will launch in fullscreen mode regardless of the second setting, but I haven't tested. Please also make sure the in-game resolution is set to 1366x768, the resolution of your laptop screen.
If you find yourself locked into a white screen again, try using ctrl-alt-delete to sign out of Windows. This will boot you back to the sign-in screen and close Sims 4 along the way.
If you're running any other apps alongside the game, other than the EA App of course, please shut those down before trying to play.
Your laptop's graphics driver is somewhat old as well. Lenovo doesn't offer a newer one for your processor and graphics chip, but Intel does:
https://www.intel.com/content/www/us/en/products/sku/196591/intel-core-i51035g4-processor-6m-cache-up-to-3-70-ghz/downloads.html
I wouldn't go straight for the newest driver considering there's no direct evidence in your dxdiag that your current driver is a problem. But once you've tried everything else above, and in particular shutting down all other apps while you play, updating the driver is the next logical step.