Sims 4 fullscreen mode keeps minimizing

@Maasterash  Interesting, I don't have any performance issues in windowed fullscreen.  But that's not really the point.

The most likely cause of this issue is another overlay interfering: Discord, Steam, even the Origin in-game overlay.  So please disable any of these or their related apps, if you currently use them; the Origin overlay setting is under Application Settings > Origin in-game.  You can also disable all Origin notifications, under the Notification header in the same place.

If that doesn't help, please try playing in a clean boot.

https://www.windowscentral.com/how-clean-boot-windows-10

I stated in my original message that I've already attempted a clean boot without any background processes running but that didn't help either and the game still would not stay open. I've also turned off every overlay and notification I can think of. Geforce, Origin, Windows Notifications, Windows error reporting. I don't believe I have any other overlay programs. Also, the more I've tried to open sims in fullscreen is less functional it is. Now if I can manage to open it before the settings revert, all it takes is moving my mouse over the X button that appears and it shoves itself right back into the taskbar.
I've also gone into the task manager and set the Sims 4 process as high priority but that doesn't seem to have changed anything either. I'm almost to the point where I've considered completely resetting my PC to factory settings (backing up and keeping all files of course) but I wonder if whatever is causing this won't change even after all that.

For windowed fullscreen, I have a noticeably lower fps and the game gets choppy and laggy if I move the camera too fast. While I don't have a high end gaming laptop, I do have a rather good one that's better than my old one, and that one ran sims just fine before its motherboard died from other causes.

@Maasterash  When you said you turned off all background processes, I wasn't sure what you meant or how you went about it: some people just kill anything suspicious-looking in the Task Manager, which is fine as far as it goes but isn't the same as a clean boot.  So I didn't want to assume you'd done one.

Anyway, please run a  dxdiag and attach it to a post.

https://help.ea.com/en-us/help/pc/how-to-gather-dxdiag-information/

Please also let me know what antivirus you use.

That's understandable. I promise that I've been through many different troubleshooting processes that I could find for people with similar problems but so far nothing has worked for me. I actually had no antivirus when the issue began but I recently got Norton to rule out malware (a full scan showed nothing wrong). I've attached the dxdiag and hopefully there's something in there that can help

@Maasterash  The AppHangB1 errors at the end of your dxdiag are most often related to the graphics driver, or one of the graphics drivers if you have dual GPUs.  The Nvidia driver you currently have installed is newer than the latest Lenovo offers for your laptop, and with laptops, you'll generally get better results with the manufacturer-provided driver than a more generic one from Nvidia.  So the first move is to clean uninstall the Nvidia driver and install thiis one:

https://pcsupport.lenovo.com/us/en/products/laptops-and-netbooks/yoga-series/yoga-c940-15irh/81te/downloads/driver-list/component?name=Graphics%20Processing%20Units%20%28GPU%29%20and%20Server-AI%20Accelerators

This guide will walk you through the process:

https://crinrict.com/blog/2019/02/clean-re-install-of-graphics-drivers-with-display-driver-uninstaller-ddu.html

Restart after the new driver is installed and before you try to play.

If that doesn't help, please clean uninstall both graphics drivers: first Nvidia, then Intel, using the same instructions.  Install the Intel driver from the Lenovo page first, restart, then install the Nvidia driver and restart again.  Or, if you prefer, you can go straight to replacing both drivers rather than simply addressing the Nvidia one.

If replacing both drivers doesn't help, please set your user and system DPI scalings to 100% (96 DPI).  Sims 4 should absolutely be able to handle your current settings, but sometimes weird things happen.  And you can always undo the changes later.

https://www.tenforums.com/tutorials/5990-change-dpi-scaling-level-displays-windows-10-a.html

I had high hopes for this one because it was something new but unfortunately even after trying everything suggested it still doesn't work. I'm at a complete loss right now

@Maasterash  Please try playing in a new admin Windows account.  The username should contain only letters and/or numbers, no special characters, accents, etc.  And make it a local account, as in, don't sign into Microsoft, and don't sync with any other services you normally use.  For good measure, try a clean boot in this account as well.

If the game still minimizes, please look for any new errors in the Reliability Monitor.  Hit Windows key-R and enter "perfmon /rel" without quotes.  You'll see a list of errors and updates, with a column for each day.  (Today is all the way on the right.)

For any errors that mention Origin or Sims 4 from after you've made the new account, or any that happened at the same time as you tried to play, click "View technical details," then copy the information and paste it into a reply.  Sometimes the Reliability Monitor doesn't update right away, so if you don't see any related errors, be sure to check back an hour or two.  The timestamp on the initial chart can also be off by up to an hour, so that's not an entirely reliable metric, but the one within the technical details should be accurate.

So I actually got another Window's update and whatever changed, the problem is now completely gone. I'm guessing something in the last update was conflicting with Sims or taking priority away from the window being opened. I thank you very much for taking time to try and troubleshoot my problems since I was completely and utterly stumped. (honestly I reset my PC and it didn't fix but then I got a random update and now it's fine).

Again, thank you so much!

@Maasterash  That's great to hear, and also very useful information.  If you have time, could you look up what the update was?  You should be able to see it in the Reliability Monitor too.  I'm just curious what the exact name is so I can look up what it's supposed to fix, and also of course in case someone else has the same issue.

I ran the monitor and there are actually several updates I'm guessing since the reset erased a lot of programs and had to catch up again, so I don't really know which one exactly fixed the problem. Sorry