Hi Andy! 😉
Each layer is color-coded, so it is easy to separate them from each other visually. So when you draw on a certain layer the line will automatically be in that color.
You change the layer-color at the little “gizmo” at the top of the layer-column in the X-Sheet. You can choose between black, blue, green and red. Soon we will enable the little color-wheel too, so you can have custom colors.
I hope this makes sense to you!