As per this post from 2009 it should be possible to select all the content for export using Command-A. As far as I can determine, DEVONnote 2 was current at that time.
Thanks for taking the time to write up what you did 
You’re welcome and thanks for sharing your process and findings.
And indeed, @Blanc is correct. Command-A in the item list is the shortcut for Edit > Select All (a shortcut common to many apps actually).
Cheers!
Yes, apologies, my mistake. You can also select a folder then shift-click another further down the list to select all those in between.
No worries at all!
And indeed Shift-selecting is possible.
Command-selecting can also be used for non-contiguous selections 
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