Trying to think of ways to find your Sims 4 folder. -- Looking at it as if I had lost my Sims 4 folder, what would I do to see if I can find it. If you've been able to play the game, it's has to be on your computer some where.
If you've tried searching your computer to see if you can find it and not finding it (Search for The Sims 4)
There are a couple more ways of finding where your Sims 4 folder is hiding.
1. Load Sims 4, go to the load game menu, click a saved game and mouse over the little folder icon under the saved game's name. Like shown in the photo below. (click image for larger view)
Hopefully this should tell you where your Sims 4 folder is located. In my game, it's shown to be located in Documents\Electronic Arts\The Sims 4
2. If you can't find it in the way explained above, another way of finding the path to where your Sims 4 folder is - Load the game, click the Options button > Game Options > Screen Capture and check the path for either video or screenshots. Either of these should tell you where your Sims 4 folder is located. (click image for larger view)
Hopefully this helps