Two radio buttons, "Navigation Buttons" and "Full Screen gestures". "Full Screen Gestures" shows three thin lines.
https://files.mastodon.social/media_attachments/files/113/020/996/003/347/179/original/62f415a0cca21336.png
Incidentally, a friend with an old Samsung mentions their Samsung has this second option for nav gestures, where the three standard nav bar buttons are replaced with three swipe-up-from-bottom areas. For the tablet environment, that is actually really nice! I would enable that if I could! It is apparently 100% Samsung exclusive and also, on the newer Samsungs it's been removed.
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