@C_R 

Thank you. However, I didn't find a way to solve the problem on the linked site either.

The probe-Capstan was part of the example worksheet, and EX_Probe was a new probe I connected to. Even if I deleted all the probes and connected a new one, I could only select properties like EX_Probe. I wanted to see the SlipVelocity property in the simulation results as shown in the example, but I couldn't find it in any of the probes except the example worksheet probe.