When you put in a note, under the "Text Format" section there is a small box with the centeline symbol and a green plus sign. Click on that. A similar option exist for dimensions.
Thanks djhurayt. Unfortunately the CF symbol is not there. The standard border for it is the same as the ST symbol, so I may look at editing that symbol replacing ST with CF.
I have it and don't think (??? ) I created it, I would look around, try under modifying symbols. But res the ST symbol is the same just change the text and save.