Use case or problem
Heading folds in edit mode don’t match heading folds in outline. i.e. When I fold a heading in one, it remains unfolded in the other.
Proposed solution
We already have pane linking 
. It would be really nice if pane linking also synced heading folds across Outlines/Edit Mode/Previews.
Added benefit: Users can toggle this syncing, simply by linking or unlinking just as we did before.
(In general, pane linking should match the current state across any panes that are linked.)