Nokia smartphones, like the Nokia 5.1 Plus and 6.1 Plus, have notches in them. That's not a surprise since it is 2018, and that's what every smartphone maker is doing. However, Nokia had an option in the settings that allowed the user to make the status bar black, and essentially hide the notch. But that option has been removed. According to a moderator on Nokia's forums, the manufacturer had to remove this option to meet "Google requirements." Now this doesn't tell us a whole lot, but since Nokia's smartphones are all Android One or Android Go-branded, that likely means that this is an Android One requirement from Google.
This removal is likely not all that big of a deal for many people, seeing as only two of Nokia's phones have notches, and not everyone chooses to hide that notch. But this is Android, and users love the customization, so as you might expect, users are not to happy with this. In fact, some are questioning why Nokia decided to give all of their smartphones Android One or Android Go branding, as they now have more requirements on those phones than before. Other phones are still using the option to hide the notch on their smartphones, but those are not Android One devices, so they have the freedom to do just that.
The Nokia 5.1 Plus and 6.1 Plus are the company's newest smartphones, that were only announced a few weeks ago. They are the newest members of the Android One family, and are also some of the first to join with a notch. So it makes sense that we are seeing some features like this one being removed now, as there wasn't a precedent for it before. But this does mean that the Pixel 3 XL may not have the option to hide its notch, and it does look to be a pretty big notch. At least according to the many, many leaks we've seen recently.