This is somewhat tricky. We have an algorithm that tries to discover relation using the whole graph. Check this structure
Note that Epic have direct relation to Product, so you can easily create Epics Backlog and other views.
Note that Feature DOES NOT have direct relation to Product. You can still create a Features Backlog board, but it will show Features ONLY if Feature is linked to an Epic (otherwise we have no idea to which product the feature belongs).