This is one way: Set the axis in one plot, right-click on the axis and select Edit/Copy Axis Settings. Then hold down the cmd-key (or ctrl-key in Windows) while right-clicking on the corresponding axis in another plot and selecting Edit/Paste Axis Settings.
The cmd-key trick broadcasts the action to all similar display boxes and works for many situations in JMP reports. However, broadcasting does not seem to work with the axis settings dialog, hence the two-step solution above.
Edit: i.e. like LouV just said...