Actually, a very common issue in JMP - further details can be found here:
Graph Builder. Combine Smoother and Line - how?
The easiest trick:
Disable Overlay for any of the other plots, just use it for the line graph.
Bsisedes that, some plots can be fixed by setting Overlay Encoding to NONE
and using the Color Drop Zone in addition to control the colors.
↑ for new JMP users (keep the plot as simple as possible)
__________________________________
↓ for more advanced users who have to create more complicated plots
If you want to create
- Bar Graphs with stacked / side by side option
- multiple smoothers in addition to line graphs
- grouped Box plots
... you have an issue.
THE solution for this issue and many others:
Graph Builder - Overlay by multiple columns
... please vote.
The issue could also be solved with a very tiny new feature :Graph Builder: Line - possibility to add breaks
The idea: For line graph, an option to remove all lines which run from right to left.
a workaround proposed by @XanGregg :
Hide the the backwards line segments by assigning their own legend color:
https://community.jmp.com/t5/JMP-Wish-List/Graph-Builder-Line-possibility-to-add-breaks/idc-p/799851...
The benefit of Color compared to Overlay:
it is less "expensive", in JMP 19, you an use up to 20 (?) columns as color : )
On the other had, just one column can be selected as Overlay : (
which brings us back to:
Graph Builder - Overlay by multiple columns