Google availed the beta version of Android 7.1.1 Nougat to Nexus 6P, Nexus 5X and Pixel C devices a few days ago, however, it appears that not everything that already exists on the current Pixel and Pixel XL is making its way to the 2015 flagship.
Like the fingerprint moves, it appears that Night Mode will also have a problem working on the Google Nexus 6P. While the former feature could be made available through a firmware update that Google is said to be evaluating the possibilities of rolling out, the latter appears to be tricky. As a result, some smart developers have found a way to enable this Night Mode feature on the Nexus 6P, but this involves a third-party mod.
One of the best additions to Android Nougat was the Night Mode feature, which is basically the same thing as what Apple calls Night Shift. With this feature, smartphone owners can enjoy using their devices during the night and the blue light that these screens emit will not affect their ability to sleep like research has claimed. However, the feature was not part of the first Nougat release, which started hitting the Google Nexus 6P back in August. Back then, Google said that the omission of the Night Mode feature was due to performance issues associated with the feature on the 2015 flagship.
Like always, some smart users came in with a feature known as Night Mode Enabler and as the name suggests, it brought this feature to some devices that were using Android 7.0 Nougat. Upon releasing Android 7.1.1 Nougat beta, this third-party app was also disabled, but there is another app that now brings back this feature to the latest developer preview version running on the Google Nexus 6P.
Given that this app has not been vastly tested, you may experience some bugs and errors in this initial version, but still, it is worth taking a look at, especially if you are unhappy with the removal of this feature in the current stable version of Android Nougat.