Hi Magma, you can extrude 2D curves into solids by selecting the curves and then running the Construct > Extrude command located here:
Then you can either type in the thickness you want and push enter, or also you can track the thickness using the mouse in either the 3D view or one of the side elevation views. Moving the mouse just in the same view as your 2D curves won't do anything since you're looking straight downwards along the extrusion direction there.
Hope that makes sense, let me know if you still need more details.
- Michael
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