As per your query, we want to inform you that since you are currently using the UI 6.1 software on your device, we have checked and confirmed that the navigation gesture full screen option is available.
You can enable the navigation gesture option on your device by following the steps outlined below:
Path: Setting> Display> Navigation bar> You can see two options navigation gesture. Here you can choose needed option by butttons or full screen.
If the issue persists, kindly report the problems with a log file. To share a log file, click on the Samsung Members Application (Open Samsung Members Application > Support> Tap on send feedback> Choose Composer> Select error report> select the appropriate issue category> Type your query and send).
