Within the extrusion feature, first click and drag the yellow arrow on the top or bottom face to freely extrude the solid. While holding down the Ctrl key, move the cursor to the target plane you want to align with—the geometry will snap to it. The same method applies to both the top and bottom faces. Click OK to confirm and finish.

After geometric features have been extracted, you can quickly generate lines and arcs based on the sketch by holding down the Shift key and using a lasso selection.

For connecting two sketch segments at a corner, hold down the Ctrl key, then click and drag the left mouse button to create a lasso selection. Ensure the selection area encompasses the end points of both segments.

After the lasso selection, the lines will become connected. Repeating the lasso operation on this connection will convert the corner into a fillet. You can then set the value for the radius (R).

After setting the Radius (R) value, click "OK" to confirm and complete the operation.

 This is usually because the original mesh model is not fully closed (it contains holes or gaps). The "Smart Surface" function generates surfaces based on the mesh topology, and if the mesh has defects, the generated surface will also be incomplete.

Recommended Action: Before using "Smart Surface," use functions like "Fill Holes" or "Mesh Repair" to ensure the mesh is fully closed, which will avoid this issue.

This will quickly reposition the object to the center of the view and adjust it to fit the display.