I believe I requested this a while back back in the Google + days. I was searching through the feature requests in this board as well as turtl/tracker and I didn’t see anything.
I’m using turtl as a GTD planner and it would be really useful to me if there was a pull down feature to view notes with unassigned boards.
Currently for me to do review I have to individually open each note to see if the board (gtd context) is missing. This is really tedious and hard me for me manage. To do a review, it forces me to go through each note in all notes to verify a board has been selected.
(An alternate/additional feature could be to display the name of the board in the note, if all notes is selected although I suspect that would require slightly more work to accomplish.)