Visualizer is displaying some type of object structure rather than a visual representation of that object

Hi,

I've been trying to run the simple Python demo (insertion_sort.py) in VSC. Instead of getting the graphical representation of the sorting (also shown in this video https://www.youtube.com/watch?v=i_v_FzfYkwg&t=631s), I get some type of web representation of the object structure (see figure). Any idea why this would be happening?