So with the recent (and welcome) changes to study assistant allowing you to only query your own books, I thought i'd create myself a collection of the commentaries, dictionaries etc I like. But the collections tool is hard to use - or am I doing something wrong? I can do a query like 'BST' and it shows me all the BST commentaries - but then if I want to add in another series I have to drag each one individually. It won't let you drag multiple books.