You can adjust the thickness of balloon tails and the type from straight to jagged.
Curved: the tail curves as it extends from the balloon body to the tail tip.
Straight: the tail extends directly to the tail tip. Useful when making callouts.
Jagged: the tail jags as it extends from the balloon body to the tail tip. Great when used with exclamations for increased drama.
Auto: the tail thickness is derived from the size of the balloon.
Thin: a very thin tail.
Medium: a medium thickness tail.
Thick: a thick tail.
Manual tail thickness settings are still governed by the size of the balloon to ensure they are not too thick so you may not see any difference between medium and thick for small balloon.
Note: This will reset any special curving you might have done for this balloon.