@Dashona Never seen that before. Really interesting (but frustrating) observation. You could log a support ticket and see if NS support can help, but iirc I haven't seen the expand/collapse on other custom sublists, so I bet it's an "enhancement". My only alternative solution would be to build two different views, one summarizing at the parent task level, and one for the detailed/all-tasks level. Then you could flip back and forth between the view as opposed to selecting expand/collapse. Of course if you have 3+ levels of hierarchy that's going to start to get unwieldy...