Hi Nayef,
I understand that you're facing an issue with the automatic brightness adjustment on your new Lenovo laptop, even though you have disabled the setting.
Would you tell me the exact model of your Lenovo laptop?
Some laptops have a built-in light sensor that may need to be adjusted in the BIOS or UEFI setup. You can try to enter the BIOS or UEFI setup interface and look for options related to the light sensor or automatic brightness adjustment. Please note that entering the BIOS or UEFI setup requires careful maneuvering, if you are unsure how to proceed, please refer to Lenovo's official documentation or contact their customer support for precise instructions.
Disclaimer: Microsoft provides no assurances and/or warranties, implied or otherwise, and is not responsible for the information you receive from the third-party linked sites or any support related to technology.
If you are going to modify BIOS Settings, please back up all your personal files first to ensure you do not lose data.
If there is anything not clear, please do not hesitate to let me know.
Your Sincerely
Hahn - MSFT | Microsoft Community Support Specialist