Select all bubbles > Editor > Edit Bubbles > Jitter
Use to randomly nudge (also called jitter) bubbles so that overlapping bubbles are more visible.
Add jitter to direction: Check to nudge bubbles so that overlapping bubbles are more visible.
X: Type a number from 0 to 1 to specify the amount of jitter in the x-direction.
Y: Type a number from 0 to 1 to specify the amount of jitter in the y-direction.