How do you reset PRAM on MacBook Air?

Answer 1

I think this article will be useful to you. https://www.makeuseof.com/tag/reset-macs-smc-pram/

Basically you need to restart your computer then press command + option + p + r at the same time, when the grey screen appears and let go of the keys when you see the start up screen and hear the startup sound.

Hope this helps.