What inspired this wish list request? When plotting bar charts, the default error bar colour for JMP is the same (or a slightly darker) shade of the bar colour. This makes it difficult to read. Currently the only option is to do this via Customize > Set the error bar colour using the RGB (1).
See: https://community.jmp.com/t5/Discussions/Default-Error-Bar-Color/m-p/772570#M95298
What is the improvement you would like to see?
A default item under Platforms to set a default colour of error bar.
Why is this idea important? I don't believe this change is particularly easy to script (I may be wrong). When plotting it is difficult to see the error bar when overlapping with the bar. This would help more effectively communicate error on a measurement.