this is not just for CorelDraw X7.
1) create an object (box) on the left of the page.
2) give extrude.
3) move the box (with the extruded) to the right of the page.
4) create another object (circle).
5) activate the extrude tool, in the property bar, click "copy extrusion".
6) click on the extrude-effect from the box on the right side of the page.
7) please report the results (os version, 32 or 64 bit, corel version).