When you place the helmet on your head, it should sit level and cover most of your forehead, about one to two finger-widths above your eyebrows. The back of the helmet should cover the base of your skull without tilting backward or forward. A level helmet provides better protection and visibility.
Adjusting the Internal Padding
Most helmets come with internal padding that can be a... https://www.uniquebikezone.com/how-bike-helmet-should-fit/#more-1783