Currently, to open or close a note takes some precision mouse control, finding the tiny arrow and pressing it, which could be time consuming e.g. when reviewing all the actions in a project. It would be easier, for example, if double clicking on the title of the action would toggle the note open and close.
There is also a possibility (already since OmniFocus 1) to open close a note by using the short key cmd+’. Just select a task/project and hit Cmd+’.
The keyboard shortcut is not working to close the note for me. It opens but will not close the note. Anyone else experiencing this?
⌘+’ is for “editing” the note, if you just want to show or hide the note you can use ⌥⌘+’
If you are already editing the note (maybe you are adding new actions), you can also use ⌥⌘+’ to stop editing and close the note.