How can I change opacity of pattern in stroke

I'll try to explain again. I am trying to change opacity of pattern. There's opacity in structure options but not in pattern.

I don't want to opacity whole stroke, only the pattern.

Another possibility is to use Create Layers 

Right click the stroke and choose Create Layer

This will turn the layer styles into separate layers that you can manipulate individually.  The big disadvantage with this approach is that it is destructive.  You can no longer edit the layer style as in you can't go back.

Are you wanting to make the white areas of the pattern transparent (show the layer below)?

One solution is to resave pattern with lowered opacity. How to do that? Determine pattern dimensions by hovering mouse over it. Create new document at pattern dimensions and apply pattern. Lower opacity then save pattern. Use newly saved pattern.