[Inkscape-user] How do I convert 2 parallel and filled lines to one line with thickness?

Hello,

I am new to vector editing software - so I might use the wrong terms. But I hope you understand my question.

I have a gif image of a black & white stick figure. I am using inkscape and the tracing tool (Shift+Alt+B) to trace it with default settings. Everything looks fine.

Now I want to change the shape of the lines with the "edit path by notes tool" and realise that the tracing tool did not convert the lines of the stick figure to one line with a certin thickness. Instead it converted the lines to two parallel lines that are filled.

*My question now is: Is there a tool or something to convert these two parallellines that are filled to one line with a certain thickness?*

Thanks, Mike