I know Dynalist is primarily an outliner app. But it would be very productive and helpful (at least for me) to have multiple columns.
Let’s say I made a list in Dynalist. I can open certain ‘parent’ or ‘children’ on a separate column so I can view multiple sections at a time. Much like what a Kanban board can do. The only difference is that it’s structured as an outliner (which I prefer) rather than “cards” typically used in kanban apps.