Hi Mingkun,
You can refer to the following documentation link to understand a newer and easier wat to visualize a rigid-body in mechanics explorer:
The documentation outlines steps for visualizing frames in "Simscape Multibody" using Mechanics Explorer. It covers showing/hiding frames, customizing their appearance, and interpreting their orientation via triads in the 3D space. Frame Transform blocks can add reference frames, enhancing model analysis and validation by clarifying spatial relationships.
Hope this caters to your desired use case!
