You can use the DM Electrical->Customization->One-Line Diagram Labels command to set the default values used for labels on your one-line diagram. These values include the existing prefix and suffix values and the new scale and alignment values.
Previously, you had to manually set the prefix and suffix for every label on your one-line diagram. If you planned ahead you could use the AutoCAD COPY command, but it was cumbersome.
Using this new command, you can set all your labels once and then not have to worry about it again. There is a section for each type of distribution equipment, branch circuit equipment connections, and feeders.