If you have static windows and only one window group, your blind combination needs to be :
“0, 1” or “0, 2” or “0, 3” etc…
The 0 sets the static window at their normal state, that is to give the option to remove them by setting “-1”, that way you can see the contribution of your window group independantly.
You need to make sure that your states are plugged in the right order so that you can control them afterwards.
The flatten function can sometimes give different orders. I deal with that using merge component or entwine.