After years of sticking to physical navigation buttons, Samsung finally switched to a virtual navigation bar on the Galaxy S8. Not only did the software navigation look cleaner, you could also change the order of the buttons. Now Samsung is introducing another customization option, but only on certain S8 models for now.
As part of a recent software update, a new circle is visible on the far left of the navigation bar.
Update for certain Galaxy S8/S8+ models allows hiding the navigation bar was written by the awesome team at Android Police.