My Sims 4 starting up in a tiny window

Nazj8  Try forcing the game to open in windowed mode.  (I realize it looks like it's there already, but it may not be.)  Go into Documents > Electronic Arts > The Sims 4, open Options.ini, search for fullscreen , and set it to 0 (zero).

If that doesn't help, please provide a dxdiag.  Hit Windows key-R, enter dxdiag in the run box, wait for the scan to finish, click "Save all information," and save the file to your desktop.  From there, you can attach it to a reply using the paper clip (Attachment) icon included with the other formatting buttons.

Hi, I seem to be having the same issue with my game window and I tried forcibly setting the game to windowed mode like you instructed above but it was already set to 0 and didn't fix the issue. So I tried the inverse and set it to 1 instead and it kinda worked. The game could run but it would keep flashing white every few seconds. I tried to play on one of my saves and it refused to load, keeping me at a dark screen (however I could exit the game just fine). Then I rebooted the game and tried to change the game from fullscreen to windowed mode which didn't put it into windowed mode and refused to respond. I couldn't even close the game or force quit it via task manager, so I had to restart my computer again. Please help.