Hierarchical grouping
When I group books by author and then display the list of books for a given author, I can sort the list say by series. I would be nice to be able to display two levels of grouping, as a tree:
Authors
Author A
Series 1
Series 2
and then be able to display only the books in a given series
I am new to Calibre Companion, so it might be already possible (how ???) but if not please add it to the wish list
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