Waterfall - need help!

[demonioazul]

I am trying to build a waterfall graph with Qlik Sense.
I get the offset idea because I've done that with Excel, but there I can choose the offset bar to be transparent and I get the result I want.
This is my test:

The offset bar is the dark blue one. I want it to be transparent. However, I have no clue how to do it. The right hand settings bar does not offer many choices:

Can someone help me?

Thanks!