Now I know when it comes to line thickness that I can enter a thickness for a particular layer before I close the vertices, and I know that I can use the line width tool to reduce the thickness later.
However, what often happens is that I find later that I want to increase the thickness of a line. What I have been doing up to now is deleting the layer or the shape within the layer and redrawing it.
I know this is stupid cos I'm pretty sure a program as sophisticated as Anime Studio Pro must facilitate that possibility somehow.
Any ideas?

Thanks.