It will be helpful to revise notes if we can open all the hidden children inside a parent rem or in a folder, to see all the notes at a once, so that we can revise all the notes before practicing.
This should be doable by ctlr+shift+down on the parent, except for manually hidden rem. However, currently, the automatic hiding (the unknowable beast that it is) is sometimes treated as manual and doesn’t unfold everything as expected.