Just hold the cursor over the Google icon on your Opera speed dial page and a small X should appear in the lower right corner.
Google is not in my speed dial and I think I eliminated most all the speed dial selections that were pre-loaded with Opera.
Thank you, but, unfortunately, the Google part is not just one of those rectangles in a line of sites that I have chosen; it is above all of those rectangles and appears as a query box above the arrangement.