It was my understanding zone fills can't be assigned to multiple layers (see https://bugs.launchpad.net/kicad/+bug/954848).
Feel free to open a new bug if you have suggestions on how it can be improved. Please first search the bug tracker for similar issues (e.g. https://bugs.launchpad.net/kicad/+bug/1667886).
It was my understanding zone fills can't be assigned to multiple layers (see https:/ /bugs.launchpad .net/kicad/ +bug/954848).
Feel free to open a new bug if you have suggestions on how it can be improved. Please first search the bug tracker for similar issues (e.g. https:/ /bugs.launchpad .net/kicad/ +bug/1667886).