New to Rhino-8 - Polyline - points but no lines

I installed the 90 day Rhino 8 on my Windows desktop computer for a class. I am new to 3D and CAD. Using Polyline, I get points, however no lines connect the points. What am I doing wrong?

Hi Lynn -

That sounds like a display issue.
Please run the Rhino SystemInfo command and copy-paste the output here.
-wim