This document can take a little time to render and respond. Slow movements and giving it time to respond before making another movement seem to work best.
You can turn on and off different layers by clicking on them (top-right corner of plotting area). If you click on “Rock off,” for example, you will turn off the surface that will be removed by this cut. Clicking on “Rock on” will turn off the surface that should remain after the cut has been done.