I have searched everywhere but cannot find an option to change the unselected colour from grey.
Anyone know how, (is it possible?)
There are two options gladly.
You can use the “unactive” color inside the tracer display menu. But you need to do it manual for every spline.
For a global one in the Action menu of the general settings (gmask submenu), you can set this value for all new created splines overall, depending on your need for the different color.
I cannot find the unactive option and the global, action option doesn’t work in the tracer on its own or in MK.