jpham0xLike @jpham0x said, the rotary knob is next to the backspace key. What may not be immediately obvious is that this means you end up with a 1U backspace (half the usual width), which may or may not work for you.
jpham0xThere's also some sort of VIA compatibility where you can flash the backspace to the R2, which seems weird, but it's closer and now I prefer. Instead of that big ass PIPE key.