In the Project Browser, open the Families folder, then open Annotation Symbols, then find out the name of the family that you want to edit. The default might be Level Head - Circle. Then, go to the application menu (the big R) > Open > Family > Annotations folder > Level Head - Circle.rfa ;
In this file, click on the "Name" label. From the Modify label tab, click on Element properties > Type properties > Duplicate the existing text type; default is 1/8" ; rename as, for example, ' 3/32" ', then change the text value to be actually 3/32". Now do the same with the "Elevation" label. Once you are done with this, click on Load into Project. Accept the 'Overwrite existing version' warning. If you want this change to be permanent in your drawings, load this into your template file, so that all new projects come with these settings.
I can get the level text to change as you described but how can I get the datum circle size to change.
I opened up the correct family and changed the radius of the circle via the Family Type dialog box.
I saved the family, loaded it into my project and checked the box to override the family. The text size of the level label changed but not the
datum symbol. Any suggestions?