7.6.2.6.1.  Extrude...

Call: Solids [Base] -> Extrude [Extrude...]..

-> The sketch is displayed in the 3D view

-> The Extrude [Extrude...]... command opens the Extrusion object [Extrusion solid] dialog box.

As soon as complete entries have been made, a preview appears in the 3D view and changes are displayed immediately.

After you have exited the context menu Extrusion body [Extrusion solid] via OK, you will see a new feature called Base extrude 1 in the 3D history [3D History].

In the 3D view, the sketch appears as a solid.