Halion 4 keyboard range

Where is the overall keyboard range set? I have poured through the manual and can’t figure this out.

I have a factory bass patch, for example, which clearly has samples whose zones extend above and below what you can actually play on the keyboard or via MIDI. You I go into the mapping panel, there is a sample that is set whose range goes all the way to the bottom of the keyboard (c-2) and, among the other samples mapped to the middle of the range, there is another sample whose upper range extends to the top of the keyboard (g8) but the actual playable range of the keyboard is stuck at b0-e5.

Where is this actually set?