How to get the Pixel Android 7.1 Navigation bar back?

Question

My brother has recently used the "factory reset" option on his Google Pixel XL phone, this made the navigation bar to change from the traditional

to one where the circular one in the middle is a solid disk (as in the first bar below). I have been looking for a way to get the original navigation bar back, but all I found were "artificial ways" whose purpose is to get this navigation bar to other Android phones. Is there a natural way to get the default navigation bar back? Thank you!

Answer 1

Seems like the problem was changing the language from English to a less common one. Once it was changed back to English the issue has been resolved.