(Adjust your keyboard brightness automatically ) not showing on system preference

Hi there mahitoshsinh,

We understand you're experiencing an issue with the keyboard brightness option not showing in System Preferences, and we'd like to see if we can help out.

Get started here: Adjust the brightness of your backlit keyboard

Since you aren't seeing that option, try starting your Mac in safe mode, and check again: How to use safe mode on your Mac

Also, create a new admin user, and look for the option there: Set up users, guests, and groups on Mac

Cheers!