Ok, I think I see what you are having issues with.
Filter stages that exceed the size of their display area will display a vertical scroll bar for that filter stage.
Scroll functions when pointer is focused on that stage will perform scrolling within that stage, and not across all filter stages.
With our current implementation, one must either put focus on a stage that does not have a scroll bar, or surgically position the pointer on the overall filter pane scroll bar (far right).
For example: attached image shows screen shot of 3 filter stages, each with their own scroll bars. User would need to position mouse on the vertical scroll bar on right in order to scroll across all filters (unless there is a hidden key combination to perform overall filter pane scroll that Kirk can enlighten me about
).
I'll bring this up for discussion with the team.
Appreciate the feedback, and please let me know if I misrepresented your issue.
-Pablo