Hi Frank,
I'm Louie, a Microsoft Community member and a fellow Windows 10 user like you. Hope you're doing well and safe there.
If you can't find adaptive brightness on your laptop you can try the steps provided on the link below:
https://www.tenforums.com/tutorials/70157-enabl...
On the other hand if your still having issues with your screen, you can follow the steps below to fix the issue:
- Turn off the Sensor Monitoring service by pressing Win + R and typing services.msc. Then press Enter
- In the services window, click on the Sensor Monitoring Service which will lead to the service settings window
- Click Stop and select Disabled from the drop-down menu found next to the Startup type
- Save changes by clicking OK
For more info about on how to turn off auto brightness, please refer on the link below:
https://store.hp.com/us/en/tech-takes/how-to-tu...
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Sincerely,
Louie