Dosen't work for me. When you selected the 1st book the line turned blue. The next book both were blue. When they are blue (even if seperate) you can do bulk operations.
My problem is when I do a ctrl m to select a book it gets pinned and turns blue.
The next book, same thing, except first book turns green (only marked and pinned, not selected). Even if I do a ctrl shift M, only the top pinned book is blue, rest green.
A ctrl a at this point will turn entire library blue (not what I want

).
So still at this point the only way i can get all pinned items to turn blue is to individually ctrl click them.
Anyway, thanks for trying.
BTW my platform is latest Windows 10. Maybe the problem?