When using objects in a plug-in, some objects are just outlined

Hi,
The plug-in is called Lands Design.
in the image below you see how the tree objects should look like (like green covered oval spheres). But in the output, I just see the outline of the spheres. I am thinking this might be some kind of setting in Rhino that I need to adjust. Do you have any idea of what changes I could make?

Hello- set the viewport display mode to Shaded or rendered in the viewport title menu dropdown list.

Is that what you need?

-Pascal

Yes! Thank you.