Samsung has added the option to hide the navigation bar when it's not in use to make it truly tangible on infinity display phones like the Galaxy S9 and Note 9. If you've always found this process a bit too cumbersome, Samsung has introduced a new feature that makes it more intuitive.
With the Android Pie Update you now have the option to completely remove the navigation buttons favoring new gestures. This eliminates the lower bar for even more screen space. While the setting is a bit hidden, it's still incredibly easy to activate and get used to.
To try it, make sure you've updated to Android Pie on your Galaxy. Then go to "Display" and select "Navigation Bar". Then tap "Full Screen Gestures" to turn it on and you're done.
Compared to the traditional navigation bar, the new gesture-based navigation tabs are far less intrusive and the controls themselves are a lot more fluid. You no longer need to swipe up to open the navigation bar, and then tap a button. Instead, you can now swipe from the area where the buttons were located: Swipe from the bottom left to open the multitasking interface, swipe from the middle of the home, and swipe from the bottom right to go back. [1