How do I get values on y axis?

[#1]

This is a screen shot of my graph. why are there no  no.s on the Y axis & what do the up arrows mean on the graph? the data is numeric & continuous. thanks

[#2]

With the arrows you can swap the order of axis. You have parallel independent axis currently (most likely you have Auto, but then JMP determines this would be the best one).

https://www.jmp.com/support/help/en/18.0/#page/jmp/options-for-axes-axes-variable-labels-or-graph-ti...

If you hold shift and click on the red triangle you can change how similar the values have to be for JMP to determine if they should be merged