How come mine doesn't look like theirs?

[videoball]

catenarytrial.gh (5.7 KB)
Their file looks like this:

But mine looks like this:

What do I need to change? I did the exact same steps.

[HS_Kim]

Try to zoom extent in your active viewport and make sure your geometry preview enabled…

[seltzdesign (Armin Seltz)]

The size of the grid you see in the viewport can change, so might be different from their example and you have to zoom out more. You can change how large the grid is shown in Grasshopper under Display > Preview Plane Size: