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This is dead easy. Using the General Dimension tool click the edge of the circle once then click outside of the circle. You should change the dimension so that it is 5mm in diameter.
Click on the number to get a box like mine. It's possible you might have double click - this happens if you happen to have clicked somewhere else on the screen and de-selected the dimension.
In the browser bar double click on 'Extrusion 1' and you should get the option box that we had when we created the extrusion, we now want to edit the extrusion so the cuboid is only 5mm thick, to do this change the number in the distance box to 5, like in my screen above.