Z Axis Type setup info:
Press the enter key on Z axis Type.
There are 3 choices for Z axis Type, press the enter key to see the 3 choices.
The 3 choices are None, no Z axis at all to be displayed.
DRO, Z axis has a scale option possibly, but is going to be manual operation only for Z axis.
Linear, Z axis is going to be controlled by a motor and either use a Linear scale or Rotary encoder for the feed back positioning.