One option that you can not find in the settings of the Galaxy Note 9 is the ability to display the navigation bar in black. Samsung has changed the default color from 8 to white, which removes the ability to return the black color. But thanks to a clear app, users of grade 9 can do it themselves.
Before jumping to step 1, be aware that there is a disadvantage. The Galaxy Note 9 uses an OLED screen, so pixels are turned off when black is displayed, which protects against aging. As a result, as the rest of the screen pixels get older, the vibration fades somewhat over time, not the pixels behind the black navigation bar. The end result is that when you view full-screen content, your navigation bar will appear brighter than the rest of your screen and affect the screen's uniformity.
Therefore, we recommend that you do not use the black navigation for a long time. By periodically switching to a colored background, you can ensure that the pixels next to the rest of the screen age, limiting the effects of differential aging (AKA burn-in). Now that you know the risk, let's move on.
: Install Navbar Apps
You must download the Navbar Apps app. This application is in the Play Store and is by far the easiest way to accomplish this.
Step 2: Change the Color of the Nav Buttons  Open Navbar apps and near the center of the screen will be two options. Choose Static Color to change the background color of the navigation bar to a single color. The default option is black, so there is nothing else to do here.
As already mentioned, however, we recommend changing the background color periodically because of the different aging. Luckily, this app has a ton of color options that fit your personality. You can use pictures, emojis, the current battery percentage and even a music visualizer as background.
Navbar Apps will take your Galaxy Note 9 back to an earlier time. You can even enjoy the look of the deeper blacks in the navigation bar – but do not hold it too long so you can avoid burn-in.