With the final release of Android Nougat, Google has introduced some new features but it has also removed some of the features that were in the developer preview. One that many people really enjoyed was the nav bar tuner. XDA user AL_IRAQI has created a flashable zip that allows you to get that feature back.
To see written instructions on how to download and flash this mod, check out this thread.
To enable the system UI setting, press and hold the setting icon in your notifications menu until you feel it vibrate.
Now you’ll see a menu for your system UI tuner in your settings. In this menu you’ll find options for the night mode feature and the nav bar. You can modify the buttons on your nav bar and even specify the amount of space in between them.
So there you have it. It’s a simple but useful MOD that brings back a great feature from the Android N developer preview.