ddim, edit a style, Symbols and Arrows tab, Center marks...
draw the circle, dimcenter, pick circle.
I tried "dimcenter" and I was able to get the center mark. But the size of the center mark was too small. I tried changing its size in Modify Dimension Properties. But the new size only applies to the new center mark that I create afterwards. The existing center mark remained in the same size. Also, after changing the size, when I select the center mark the Dimension Style option freezes. Can you please help me in this ?