Try this:
Change the axis settings on one graph.
Right click on the axis you just changed
Edit>Copy Axis Settings.
While holding CTRL. (or Command on Mac)
Edit>Paste Axis Settings.
In my hands, this broadcasts the copied axis settings to all the boxes. If you happen to have any categorical factors, they get this too, and it kind of messes up the scale.
JMP Systems Engineer, Health and Life Sciences (Pharma)