I think I know what was the issue, exactly what two of you explained, I did not click on the child “Sequence”.
I needed to select “the lowest” level scope in the chain to see all the parents as an option, its not showing the “child” scopes, which is very unusual way… but I am not surprised, UiPath does a lot of things upside down 
[edit]
Yes, when I select an other scope, I can see all “ancestor” boxes, but not child or “sibling” level boxes. I hope you understand what I mean
(in this picture I first clicked on the top “bar” of “Sequence 1.2” then it shown as an option.
