Extrude in Rhino


I’m completely new to Rhino7 and when I draw a polyline and then when I want to extrude it’s not a solid volume, it is actually empty inside, and I’m sure that it is a closed rectangular.
What is the problem here?

Use _ExtrudeCrv and check the “Solid” option in it.

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It worked, thanks a lot

I have another problem I’ll be glad if you could help me, how can I change the dimensions of a polyline after I extruded it? Practically is it possible to do so?
For example my polyline has a 3 meters length and I want to change it to 2.8 meters.
Thanks a lot

Try _Scale1D and _Scale2D, and eventually check this: