You click the Panel Configuration icon on the Panel Layout toolbar. Next click the Setup button in the balloon category (see attached screen image). You can enter the text size, arrow size, and balloon diameter. You can also select various balloon styles.
I have no problem setting mine to 0.250 text size and arrow size, with a 0.625 balloon diameter. I don't know why it isn't working for the other user who started this thread. I can only speculate that perhaps his drawing somehow contains more than one WD_PNLM block and it is causing confusion. The selections you make are stored as attribute values in a hidden block called the WD_PNLM block, located at coordinates 0,0,0. You can make this block visible by typing ATTMODE at the command line and pressing the enter key. Then type the number 2 and enter. This makes hidden attributes visible. Zoom to the lower left of your drawing and you will see the WD_PNLM block. To return to normal mode, type ATTMODE at the command line, press enter, type 1, and press enter. ATTMODE 1 is normal, ATTMODE 2 reveals hidden attributes. Note: Schematic drawings contain a hidden block as well that stores the schematic drawing configuration settings. This block is called the WD_M block and it also resides at 0,0,0.
Doug McAlexander
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