Working with lanes problem

Hi there ! Sorry for my English… it’s a little complicated to explain
I’ve recorded some audio tracks wit the lane function. With N6, i can only listen to the last lane, when i mute a part of the file, the other lanes stay in grey. I can only use the “bring back to front function” to hear the others lane. I have to cut the file and delete the part to listen to the lane above…With N4, i can mute a part of a lane then the part of the lane just above can be listened automatically (it becomes green).
Where is the pref to do that ??

Thank you very much !!

same kind of problem here