September 2022
@ZoomerGirl Try steps one and five in this guide:
https://www.tenforums.com/tutorials/70157-enable-disable-adaptive-brightness-windows-10-a.html
For step five, your graphics driver is old enough that it may not have all the listed options. While it's generally not necessary to update a driver that's working fine, in this case, it's worth doing if nothing else helps. You can get the newest driver from Intel for your processor and graphics chip here:
Run the installer as an admin: right-click on the download and select "Run as administrator." Restart your computer afterwards and before trying to play.
It's possible that the newer driver will handle screen brightness properly on its own, so if you prefer, you can start by installing the driver and test that before changing any other settings. Either way is fine.
September 2022
@ZoomerGirl Yes, the issue is that the OEM driver you currently have installed is blocking you from installing the driver from Intel. It is in fact usually better to use a driver provided by the manufacturer of your laptop, but not when that driver is seven years old or is apparently not working properly. I was hoping that this wouldn't be a problem for you—sometimes the manufacturer provides an update that then allows the installation of generic drivers, usually when the company isn't going to release any more new drivers itself for the product.
Anyway, I'd use the linked instructions for clean-installing the Intel driver and see where that gets you.