How to prevent Toon Boom from making double bone structures?

Everytime when I want to make a bone structure, Toon Boom automatically duplicates it (see attached picture).
I am not able to select or delete it (= the red dotted line).
How do I prevent Toon Boom from doing that?
The file:

What are the steps you’re following in creating the bones?

You should contact support for this one because there’s
no obvious answer for your question.

It’s not a duplicate bone structure. You’re seeing the resting position and the active position because the Show All Controls button is activated. You need to customise your deformation toolbar to turn this button off and then you will only see the green (active) deformer. Here you go:

I see. Thanks for your answers! :slight_smile: