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First step would be to get everything you want exported into the display. You could use the built-in All Items perspective, but you'll want to change the selectors if you don't intend to export completed or dropped actions/projects.

Then, if you are using the 1.6 Sneaky Peek release, you can simply do Edit->Toggle All Notes (cmd-opt-') to open/close all the notes.

Otherwise, select everything in the main pane, then do Edit->Edit Note (cmd-') to open/close all the notes.